Help!

Bella
Hey guys so I have an awesome life and I'm not trying to complain too much it's just that I'm 14 (still in school) and there is a really mean girl at my school. She is just overall bitchy and she's done too much for me to tell you everything she's done. Do you guys have any tips? To give you an idea of what she's like is that she says I have a big nose, I'm fat, I'm a slut. I don't know how to fight back because it's been 4 years since I was bullied. Just a disclaimer, when I was bullied I was suicidal so I don't want to trigger anything like that ever again.