She is messed-up. It doesn't matter what she thinks. I really don't care what OTHER people think about me, especially if they are CRAZY!
All that matters is what I think of myself, and I AM a good person.
You have a job. You are earning a degree. Those are very important and commendable milestones. You must have some things going for you.
Do you like your job? Do you have good prospects for a promotion after you get your degree or will you have to move to a new company at that time? Focus on what your next career move will be.
Focus on who YOU are and what YOU want. YOU are not defined by HER!
