My friends being a B**** and i wanna tell her off, what should i say?

***!!!!!!!!!! UGH!!!!!!!!! Im so tired of the stupid B****!!!!!!! Sabrina is THE BIGGEST F****** B***** in the school!! She was talking about me. In front of me, to one of MY friends! And now she is ignoring me, mostly because she knows that i know. And OMG im about to punch her F****** face in! But her fat a** would sit on me and smother me to death. Ha ha. And my best guy friend is so standing up for me and dissing her, like he's supposed too. So yeah and i have to go to the contest with her and my friend tomorrow. And my friend, ugh she is not even standing up for me which pisses me off so much! But who cares. And when we went to Branson she borrowed my shirt. And still hasn't given it back and she wore it today. And i let her borrow my Breaking Dawn book.. And she is reading it. Right now. God, if i make it through today without punching her face in it will be a miracle. Im so writing her a note. Dumb B****. And she is totally doing things to stand out and get on my nerves and we have literally every cl together except P.E. and ima UGH! She is so annoying! I dont know what to tell her, im thinking of something really mean... But IDK.