I understand it must be difficult to deal with the conflicting emotions with this friend. It's especially hard when you have a history with the person, making it hard to cut ties completely. It plays with your emotions. I've been there. However, not every friendship is meant to last, and some friends grow apart, and that's okay.

A few things you pointed out: You aren't sure that you can trust her, she can be mean, she plays "victim" a lot. Ultimately, it is not your responsibility to help her with these types of issues. She needs to seek professional help and work on herself. It sounds like this friend is bringing a lot of negativity into your life, and friendships should go both ways. Maybe taking a break from the friendship is needed at this time? It's something to consider.