And police believe it all may have been sparked by an argument over cigarettes.
Clearwater Police Department detectives say Samantha Broadhead and Ault poured gasoline on the bedroom floor and bed of Samantha's mother Nancy Broadhead, and then set the room aflame.
The pair then escaped in the mother's 2007 Ford Focus, say police in Clearwater, about 20 miles west of Tampa on Florida's Gulf Coast.
The 47-year-old mother was awakened by a smoke alarm and managed to escape. Police say Nancy Broadhead sustained serious burns and smoke inhalation, but her injuries were not considered life threatening.
Her daughter later returned to the scene and agreed to go to police headquarters for questioning. Ault was located at a friend's house and taken into custody.
The young Florida couple have been charged with attempted murder and arson.
Police spokeswoman Elizabeth Watts said the motive was "probably just typical teenage angst."
Watts said there was ongoing tension between Samantha Broadhead and her mother, which escalated Monday when Samantha Broadhead Broadhead's mom confronted her about stealing some of her cigarettes.
Ault has been taken to a juvenile facility, and Samantha Broadhead is undergoing a mental evaluation. It was unclear if either suspect has an attorney.