Yes, you're already on the right path. Though most people may say revenge is never the right path, it is the only tool that can permanently cure this evil. She will continue to manipulate and hurt others until you can show her the error of her ways. You mentioned her claiming you "just wanted attention," and that she "cried" when you tried to prove she was lying. Take her own tools and crush her at her weak points. Kill her where it counts (socially). She's obviously reliant on her friends approval, so turn them against her; she will fall emotionally into a state of insecurity, and possibly depression. Take it further since she hurt your anorexic friend. Crush her with weight insults. Spread false rumors about her to destroy with her self-consciousness and social insecurities. Blatantly make her cry and call her fat when she is surrounded by your mutual friends; this is the time to strike the ultimate blow. Reveal all the hidden truths. Tell them about your father and bring some form of proof of his beatings. Tell them about your anorexic friend (convince her to back your statement). Tell them about her social manipulations (they should experience the revelation when pointed out). Crush her in your own unique way. I've only given you a mear outline of the potential downfall of her empire. Crush her for the sake of justice. People never forgive, only forget. Don't rush into things. You must plan, plot, and spy. Wait for the oppertune moment and crush her. She will fall in due time, until then have patience and be contented in knowing you shall have revenge. Show her what it means to have fear.

Remember; she will only continue to hurt others as well as herself. I speak from experience when I say you must crush her for the sake of the greater good. To show mercy is to harbor evil. Man is a monstrous beast, and he must be tamed.

Revenge won't solve this. Take a lesson from Batman Begins and The Dark Knight.

First: Revenge and Justice are never the same, revenge is just making YOURSELF feel better.

Second: You either die a hero or you live long enough to see yourself become the villain.

Cunt punt. Problem solved.

is that Fat Alex's sister?

Define within "reason". Play her game against her.

Gain her trust. Then become her friend. Then tell everyone shes pregnant/had an abortion.

Thats not really believable, trust me NO ONE would shag that thing.

Well,in that case man,I would just walk away,I mean,if shes a dumpster fire from hell,then yeah,walk away. Sure itd be nice to make her cry or what not,but walking away simply proves youre a better person.

I hate manipulative bitches myself. Ive dealt with quite a few and to be honest,walking away and taking away the fuel to the fire tends to make them stop. If not,snapping and verbally ripping them a new asshole can work too.

Unfortunately yes.

okay. Well how should i start?

I'm really sorry about what your father did to you.. do you still live with him?
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Revenge will do nothing good.. please don't do it.. if she is manipulative don't give her a chance to show it. Gather your friends around you and ask every single one if they trust you or not. When they say yes, her lies won't have a chance to harm you. Pleaso don't ever give a fuck about people at school.. many of them have issues themself.. just leave them alone (including this bitch) don't even talk to her. don't pay her a shitstain of attention. That is everything those people want, maybe she has borderline syndrome, you can't win this fight if you go down to her level.

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you need selfconvidence, please start doing material arts, i think this will help you alot. DO NOT FIGHT THIS GIRL MAN! do you hear me? that will cause a shitstorm you can't imagne. Please just make yourself strong and don't give a shit about what people cloud say. that's the best i got for you mate.

Thing is we reside within an a 'group' of mutual friends. Me and three incredibly close friends know about her manipulative ways, but now the rest of our mutual friends (about 30 of them) hate my guts. I attempted to tell one of them at a point, but fatcow broke down i tears and claimed i was lying. Oh, she has a huge sympathy factor going on too- she is faking MS. She left a tablet at mine when we were friends and i found out it was in fact not 'experimental MS medication' but an iron tablet.
No, my father and i no longer live together. I live alone now.