She does need help and if she cannot get it from her school, she needs to get it somewhere else.

Just because you don't think she's "not that type of person" to keep a journal, doesn't mean it wont help her. Maybe you should/could suggest it?

Cutting/self-mutilation is a cry for help. She's telling you because last time you helped her. Maybe that's why she's doing it again.

You do have your own problems. I think you're very kind to worry for your friend.

I hope things get better for you both.

Hugs,
Kelly