If she's into drugs, go to the police. They'll at least put her off that for a while, maybe make her go through detox or something. Have you talked to her about it? Talking to her parents should be the first step, but if she's cutting herself and has 30+ piercings, it sounds like they don't care much. Also, talk to like a minister or something, they might be able to recommend something. They get lots of questions about stuff like that, and might be able to recommend something (besides prayer). You could also call a substance abuse hotline and ask them what to do about her. Go through the phone book, usually they have stuff like that in the front.

Adrian