Alia Sierra (Photo: Provided) 
 
 FRANKFORT, Ind. — A 17-year-old girl had drugs in her system and was driving faster than 100 mph when she crashed into a Clinton County home, killing two children, according to charges filed Thursday. 
 
 Alia Sierra, of Frankfort, faces 10 felony charges, including two counts of reckless homicide in connection to the deaths of 17-year-old Haleigh and 9-year-old Callie Fullerton, who were killed July 13 when a car careened through their living room and nearly came out the other side of the structure. 
 
 Sierra also faces two counts of causing death while operating a motor vehicle with a schedule I or II substance in her body. 
 
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 A urine screen showed that Sierra tested positive for opiates, and detectives determined she was driving 107 mph at the time of the crash, according to findings of the investigation, which were cited in a probable cause affidavit. 
 
 Sierra was westbound on West County Road 300 North when she left the right side of the road, traveling roughly 100 yards and missing several obstacles before becoming airborne and slamming into the side of the home, according to court documents. 
 
 Four more people were inside the car at the time of the crash. 
 
 Three passengers interviewed by detectives said they were picked up by Sierra that evening but asked to get out of the car when she began to drive unsafely, according to their statements to police, which were cited in the affidavit. 
 
 One passenger said Sierra hit a bump, swerved and lost control of the 2007 Honda Accord; another passenger recalled Sierra saying her car was "the beast"; a third passenger observed the speedometer exceeding 100 mph, according to court documents. 
 
 When one deputy arrived to the crash, he observed a juvenile female who was unresponsive and was "lying half under the front driver's side of the car," according to his account of events cited in the probable cause affidavit. 
 
 The girls' mother, Bridget Fullerton, was airlifted to an Indianapolis hospital with multiple injuries, including "an item protruding from her chest and blood from her face," according to court documents. 
 
 The crash caused extensive structural damage to the Fullertons' home, which is valued at more than $110,000, according to court documents. 
 
 Sierra also faces two counts of causing death when operating a vehicle while intoxicated; two counts of causing serious bodily injury when operating a vehicle while intoxicated; one count of criminal recklessness; and one count of criminal mischief. 
 
 Sierra was charged as an adult Thursday, and she appeared in court Friday for an initial hearing. With her head hanging low and her long black hair obscuring her face, she entered a preliminary plea of not guilty, solemnly answering "yes" when questioned by Judge Bradley Mohler. 
 
 Her bond was set at $12,000. 
 
 After the crash, Sierra was attending school and working a part-time job while on GPS-monitored house arrest under Clinton County's juvenile justice system, according to court testimony. 
 
 Sierra's defense attorney, Steven Knecht, said he plans to appeal the decision to charge her as an adult. 
 
 "We expect the matter to be reversed on appeal (and) returned to the juvenile courts," Knecht said. "It's always in the best interest of a 17-year-old to be in a juvenile court. There are far more treatment, rehabilitation (options) in the juvenile system than adult court." 
 
 He added that Sierra does not have a prior criminal background. 
 
 Christine Smith, chief deputy prosecutor, said Sierra was charged as an adult based on her age and the seriousness of the crime. 
 
 "One of the main factors in looking at it is the severity of it," Smith said. "And then you also look at what are my options, what can I do with this juvenile, this criminal defendant, to rehabilitate and make sure something like this tragedy never happens again?" 
 
 Alia Sierra, 17, of Frankfort, arrives to court Friday, Aug. 18, 2017. (Photo: Joseph Paul/Journal & Courier) 
 
 Reach Journal & Courier reporter Joseph Paul at 765-420-5339. 
 
 Read or Share this story: http://on.jconline.com/2xb56i5 ||||| CLINTON COUNTY, Ind. -- The 17-year-old girl accused of crashing into a Clinton County home and killing two sisters was going over 100 mph and had was driving under the influence when she left the road, according to court documents. 
 
 Alia Sierra is facing ten felony charges, including two counts of reckless homicide for the July 12 crash that killed Haleigh Fullerton, 17, and Callie Fullerton, 8. 
 
 Sierra is also facing multiple felony charges of operating a vehicle under the influence. According to court documents, a urine screen showed that she tested positive for opiates after the crash. 
 
 Detectives determined she was driving 107 mph when she went off the road, through a ditch and field before crashing into the Fullerton's residence. 
 
 Four teens between the ages of 12 and 17 were also in the car with Sierra at the time of the crash. The front passenger told detectives that he asked Sierra to slow down before they hit a bump that sent them off the roadway. 
 
 RELATED | Teen accused of crashing into Clinton Co. home and killing two sisters charged as adult 
 
 Another passenger in the back seat told detectives that he had asked Sierra to let him out of the car several times because she was going too fast. He said Sierra called her car "the beast" and talked about how fast it would go before the crash. 
 
 Sierra is facing the following felony charges: 
 
 Two counts reckless homicide 
 
 Two counts causing death when operating a motor vehicle under the influence of a controlled substance 
 
 Two counts causing death when operating a motor vehicle while intoxicated 
 
 One count causing serious bodily injury when operating a vehicle while intoxicated 
 
 One count causing serious bodily injury while under the influence of a controlled substance 
 
 One count criminal recklessness 
 
 One count criminal mischief 
 
 Sierra's next court date is scheduled for October. 
 
 RELATED | Teen accused of driving vehicle that crashed into Clinton Co. home, killing two | Community holds vigil for two girls killed after vehicle crashes into Clinton County home ||||| Authorities say a teenager was traveling at more than 100 mph while high on opiates when she crashed her car into a house in Frankfort, Indiana, last month — killing an 8-year-old girl and her 17-year-old sister inside, PEOPLE confirms. 
 
 On Friday, 17-year-old Alia Sierra appeared in an Indiana court where she learned she had been charged as an adult with 10 criminal counts, including reckless homicide, causing death while operating a motor vehicle with a controlled substance in the blood and criminal recklessness. 
 
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 Sierra pleaded not guilty to the charges. PEOPLE was unable to reach her attorney for comment. She remains in jail pending her trial, which is scheduled for November. 
 
 The July 12 wreck killed Callie Fullerton and her older sister, Haleigh Fullerton. Authorities say the sisters were snuggling on a couch, watching TV, when Sierra’s 2007 Honda Accord slammed into their home, pinning them both beneath it. 
 
 Their mother was also injured in the crash but is expected to make a full recovery. 
 
 Soon after police arrived on the scene, Sierra allegedly told investigators, “I killed those kids, man,” according to an affidavit obtained by PEOPLE. 
 
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 The Fullerton sisters, who were killed in July when a car crashed into their Indiana home. GoFundMe 
 
 Alia Sierra 
 
 Police said Sierra was driving with four passengers at the time of the crash and estimate her speed was 107 mph. 
 
 One of the passengers told investigators that she had asked Sierra to slow down. The affidavit states that another passenger said Sierra allegedly told them her car was “the beast” and that she talked about how fast it could go. 
 
 Sierra told police she was driving 80 mph when she hit a bump and lost control of the car. 
 
 After the wreck, her urine tested positive for opiates, authorities said. 
 
 A GoFundMe has since been set up to support the family of the slain sisters. It reads, in part, “These two beautiful ladies were taken too soon and while their time on this earth was short they touched every hear they came in contact with.”
– The opioid epidemic may have claimed two wholly innocent victims. Police say the 17-year-old who killed two sisters after the car she was driving crashed into the girls' Frankfort, Ind., home in July was high on opiates. RTV6 describes a harrowing lead-up to the crash, citing detectives who say Alia Sierra was driving her 2007 Honda Accord at a speed of 107mph when she left the road and careened through a field and ditch before slamming into the home. She had four teen and pre-teen passengers in the car with her; one told police he asked Sierra to let him out of what she called "the beast" because the speeds were scaring him. Sierra faces 10 felony charges, including two counts of reckless homicide in connection with the deaths of Haleigh Fullerton, 17, and sister Callie, 8. People reports the girls had been watching TV on the couch; the Journal & Courier says the car entered their home with such force it nearly exited the other side of the living room. Sierra has been charged as an adult and entered a preliminary plea of not guilty on Friday. Her lawyer plans to appeal the adult classification in a bid to get her case pushed back to juvenile court. (This teen who livestreamed a fatal crash says "everybody does it.")