Kids!
The reason she doesn't get along with her parents is BECAUSE she probably got pregnant at 15, and may be up to some of the same behavior. Kids sometimes think they have it bad at home, but once they are grappling with what life is like on the outside, home doesn't seem so bad. She may have a place to go to for now, but I guarantee if she doesn't immediately get a job, those parents are not going to want her "freeloading" off of them. Where will she go then? Also, finding a full-time job at her age without at least a high school diploma is going to be tough (a lot of college graduates can't even find a job right now), and if she does find a job, it probably won't pay enough for her to live on her own. It will be an eye-opening experience for her. I wish I had parents to go home to... I hope she is reading this. I have a niece who kept showing up on my doorstep because her parents got sick and tired of trying to help her out. They now want nothing to do with her. Once she is "emancipated", she may find herself in the same boat (without the proverbial "paddle").