Should I learn self defense?

I got into a fight with this one chick about a week ago, she was my "friend" but decided that she doesn't like my and blatantly told me so because I "really piss her off". After a few angry text messages were sent back and forth i deleted her number and have been trying to forget about it. We are both going to be in choir together next year and I'm not looking forward to seeing her again. Her twitter even mentions that "the feathers are gonna fly August 29th" (first day of class) a lot of her friends are also in choir too and I don't want them ganging up on me. I don't want any drama because We are in college and I don't want any silly fights to get in the way of my education. If she nit picks in class I'm just going to ignore her because I have my own friends in choir to back me up and her immaturity is not going to bother me, but if she lays a hand on me after class what should I do? I don't want to get in any fistfights because I don't want to get kicked out of college. Should I learn self defense to protect myself? This whole drama is ruining my summer. :(