And drop out of the limelight for a while.
I'll vote for that. However, I am going to add that her mother should stay the fuck away from her. She's the one who "likes a party almost as much as her wild-child daughter" and she will NOT help get this girl sober. Please, any of us who have EVER had what you might consider a "drinking problem" knows this. She needs somebody clean to hang out with, not someone who's going to say "you know what'd make you feel better? A drink, some coke, some vicodin...". Stay away from her, you filthy coat-tail riding whore of an unfit mother!