(CNN) -- A 14-year-old autistic Michigan girl whose mother allegedly tried to poison her with carbon monoxide in a murder-suicide attempt is recovering well, authorities said Tuesday. Isabelle Stapleton is "awake" and "responding," according to Sara Swanson, Benzie County prosecuting attorney, after being in critical care for carbon monoxide poisoning following a grisly incident last week in which her mother allegedly attempted to take both of their lives. "Her condition has continued to improve every day" since the weekend, Swanson said. On the evening of September 3, Kelli Stapleton and her daughter were transported to hospitals for treatment of carbon monoxide poisoning after police discovered them unconscious inside their family vehicle in a wooded area, according to Sgt. Malcolm Irwin of Michigan State Police.Isabelle Stapleton, 14, was found with her mother in a car with charcoal grills burningAuthorities say the mother was trying to kill both the autistic girl and herselfThe mother had blogged that she was suffering "a severe case of battle fatigue"
She is being held without bail and is to appear in court on September 16 for a preliminary examination, according to _.