im sorry you are going through this.. i went through something similar when i was in school. i had this girl who was in alot of my classes and would go out of her way to make fun of me, call me names, embarrass me in front of classmates. and for no reason..i would hate going into classes just because i didnt feel like dealing with whatever she was going to do/say.. luckily i had a few people who would make me feel better by standing up for me. i became depressed and didnt know how to fix it because i didnt DO anything or say anything to her to even make her treat me like that. at the time i didnt have very many friends but the ones i did have were quality friends and just talking to them always made me feel better. she adventually just stopped being mean to me.. not sure why ..maybe she just grew up a little. i would talk to your friends and let them know whats going on..if they are any sort of friends they would trust your word over hers. i would just try to avoid her at all costs if possible.. talk to a counselor at school to see if they can help at all. i dont understand why people have to be like that and im sorry you have to go through that. hope things get better for you.