Sorry to hear about your experience. It sounds uncomfortable, unhelpful, and actually toxic. But I think it's a very good sign that you were so aware of your reactions and what was happening there. You may not have a degree or much money right now, but you have other resources, like your intelligence and understanding of relationships, and I'm sure many others.

Personally I would not befriend such a person or, if we did keep in touch, I would not trust her with my feelings, issues, etc. Definitely not ask her for help when I feel down again. But the choice is yours since this is a situation in your life, and if you look at your options you can choose what feels best for you at this point.