Thanks for the great advice so far. Therapy is something I recommended to her before, and tonight I talked about it again...she told me that her mother told her that if she went to therapy, then she wouldn't trust her anymore (she told her this on the same day she found out she was cutting herself) My question is WHY THE HELL would a parent say this? It's incredibly destructive, as I think what she needs more than anything right now is some sort of professional counseling. She completely resists the idea of talking to her mom about this, and didn't want me to talk to her either. (Her mom had always struck me as pretty reasonable, and she likes me a lot) We decided that we'd decide on a course of action when I see her in a month, but she's made an early New Years resolution to me that she'll work at getting to the bottom of this.

Thanks for the comments, please keep them coming!