An ex-friend is starting romers and being an allaround b-otch. I need revenge.?

About three or fore months agowe where good friends, bouth in a fairly tight grope of about 5, than out of no where she starts going all quean bee. I have helped her through a lot, and trusted her with practically my life. And out of nowhere, she ses she dosent want to be friends anymore. When I asked why, she just said because she didnt like my personality and attired off. I'm a kinda ruff and tumble kind of girl, and tend to get along better with guys. At first she just ignored me, an I her, but after a few weeks, she brought started to get the others, who are still my friends, to shun me from sitting with then, and hanging out at lunch and stuff under three of getting "kicked out or shined" themselves. thow i dont care if there friends with both.they didn't rilly with it, but now our relationships are all strained. I have enother group of friends that is very tight that I hang our with most of the time, but she's still starting roomers and dising what im wairing behind my back and stuff. I've tryed the ignore it, and the be the biger person, that just made things slower to happen. I've tryed the blow it off, and make her look like the bad person, but she allways goes off and ses that I said something else. I've also tried a few other things, to no avail. Yesterday, she touched on some personal subjects I had trusted her with, and I amost just kicked her ***, and would have if a couple of my guy friends hadn't of stoped me and droug me away. I can't get in a fight or I won't be able to go to promotion. I am fairly bright, and not quick to jump, but. This has gon on to long, I need revenge. Something I can not get cough at, but will make a big hole in her ego balloon, and put her in her place. IDEAS PLEEEEAAASSSEEE!!!!!!!!!! and for those of u who will try to say that revenge isn't the answer, It's either that, or I kick her ***, so think about that.