Please help! urgent!?

I used to be best friends with this girl from school, but now that we are not so close, i have started to notice just how nasty and vindictive she can be! She is constantly using vulger language in everyday conversation and she holds herself higher than any one else. She believes she can have any boy she wants.Recently, she has been quite nasty to me and usually, I would confront someone about this type of thing but the problem is, she is bigger and stronger thanme! she is quite violent and I fear she may hit me if i confront her. also, I know she will disagree with me and say that i am the nasty one, because she always has to be right and is very stubborn so I considered not confronting her at all...but the situation is making me quite unhappy and I know I will have to face her everyday at lunch! I know it may seem immature, but she is beginning to turn my friends against me. please help...ASAP!