My friend won't listen to me?

My friend nikki is ignoring me and she won't talk to me. She's being a biitchh and i don't like it. I can't stand her she thinks she's so cool but she's being an asss and thinks wearing skinny jeans and a ghetto hat makes her cooler than me ugh and she's trying to steal my bff and trying to steal all my friends---she invited my bestie to her big party and not me obviously and today when i asked her why she said **** off! Uggggghhhh help me get rid of her