Ok im fighting with a friend...help?

ok well i used to be friends with this girl, we are fighting now because she is a lier, a back stabber and has a big mouth, but n e wayz me and my friends are fighting with her, and i dont think that she has a problem with me but she does my friends, and now that all off this is going on there are alot of rumors about me and i hate it! she judges the men i go out with and starts rumors about them tooo! i really just want to sock her but i know vilolince isnt the key, so what do i do?