Friend problem?! help!?

Okay, I was friends with this one girl, her name is Autumn, and we were like sisters for a whole year. This year, school starts up again, and we were friends until about August 30th. She got in a sudden rage of hatred for me for some reason. At first it was because I had sprained my ankle on the day of a stupid game of homeroom tug of war, and she couldn't be in it, but she went home anyway because she threw up in the gr outside. You would think we'd be friends again after that, wouldn't you? but we are not, now she is calling me names behind my back, giving me the 'evil stare' down, telling my best friends to stop being my friend, and spreading rumours. Like she calls me lazy, fat, racoon face, selfish, and a brat 24/7. she tried to tell my other friends not to be my friend anymore, but they stopped being her friend because of it, they are mad at her too now. I'm only mad because she keeps making things up, and not telling the truth from the beginning, that's the only time I get mad. If she would just tell me the truth, I would forgive and forget, that's my motto kinda thing. How should I handle this situation? I don't know what to do...it's awkward when she sits at our lunch table but no one talks to her at all. she once told me she was jealous of me...I don't know why she would be jealous of me even, I have nothing to be jealous of..one of my friends said it was because she wishes she could be a person like me, and that she wants my life over hers anyday...seriously how should I handle this? I've tried talking, she won't listen. I've tried notes, she rips them up. I was thinking of going to a teacher next because of the name calling thing, she could get suspended just for that...but i don't want to have to go to that. I've tried. any thoughts, ideas, and stuff on this middle school drama crap?