Does it count as slander? What should I do?

[864]

Ok, so me and my friend fell out and her dad kept shouting at me and messaging me on Facebook ever since she said she had better clothes than me.When we went back to school on Monday she completely ignored me, so my friend asked me what was up. (Everyone assumed she was my cousin) So my friend who is older as she is two years ahead of us, goes up to my friend and simply tells her easily to back off and leave me alone. My old friend that I fell out with spreads the word I had told my "cousin" to bash her teeth out and beat her up. Several days later she spreads the word to many friends we share between ourselves that I was a massive bully and told a few to stay away from me and ignore me. A few people didn't believe her but then she started telling a lot of people so it could be a kinda new gossip round the class. I assumed her dad told her to do it and the reason is he and the girl I fell out with's mother had also been spreading the rumor that I was a bully. Don't get this idea shes the schools queen because she's quite shy and just shadows around people but can tell a heck of a lie when she want's to.After she moved schools (at first when we were friends she told me it's easier to get to the other high school) her parents (and herself) developed on the rumor by saying the bullying was getting out of hand and I was not a girl to trust. Since that a few people started talking about it and then I noticed a few of my friends telling me what she said. I don't what to do