Here's what I'm thinking. I believe that your mother is self-destructive because she hates herself. I believe that she hates herself because she is profoundly emotionally sick and doesn't want to make the necessary changes to be healthier - in part because she doesn't feel that she deserves a better life.

Unfortunately, you have been caught in the web of her sickness. If I were you, I would work on taking the focus off her - and off the jerk who molested you - and truly focus on your own well-being. It's not easy, but I suggest that you stop giving those people any attention. If they "haunt" you, or if you dream about them, see it solely as a path to bringing you back to yourself. To put it simply: let go of that old story and create a new, healthier story.
Best of luck to you.