New York ( CNN ) -- Investigators and rescue teams will continue their search Friday for a missing 13-year-old Texas girl , focusing near a densely wooded area and along the Colorado River . Meanwhile , Hailey Dunn 's mother , Billie Dunn , told HLN 's Nancy Grace that she and her live-in boyfriend , Shawn Adkins , both failed polygraph exams . Adkins was the last person to see the eighth-grade cheerleader on December 27 at Dunn 's home in Colorado City , according to local reports . Colorado City -- a rural central Texas town -- is about 70 miles west of Abilene . Hailey reportedly told Adkins she was going to visit her father and then a friend . Hailey 's father , Clint Dunn , says she often came to his home but did not on that day . Dunn said she took the polygraph test after she was informed that Adkins had failed . Woodrow Tripp , a polygraph expert , told Nancy Grace that troubles him . ''That absolutely would cause major problems emotionally as she 's administered one . You want to try to minimize that as much as possible , '' Tripp said . Dunn did not say who administered the exam , during which she says she was asked if she knew anything about or caused Hailey 's disappearance and whether she feared any questions . The night Hailey vanished , Dunn says she thought her daughter was sleeping over at a friend 's house . Asked why she did not confirm Hailey 's location before going to bed that night , Dunn said , `` I just do n't have an answer for that . I wish I would have called to tell her goodnight . '' Dunn says police questioned her for more than 10 hours on Wednesday . She met Adkins on the MySpace social networking site more than two years ago , and he moved in with her several months ago . Police initially considered Hailey a runaway , but the situation is now a missing person case . A Texas Amber Alert has not been issued , reportedly because no one saw Hailey being abducted . Hailey is 5-foot-2 and weighs 120 pounds . She has hazel eyes and brown hair with blond streaks . When she disappeared , she was wearing navy blue sweatpants , a light colored short sleeve T-shirt , and pink and white tennis shoes .
Hailey Dunn , a cheerleader , has been missing since December 27 . The girl reportedly said she was going to visit her father . Her mother 's boyfriend was the last person to see her alive , according to local reports .