Help!?? middle school drama?

Ok soo ill try to this as short as possible. soo i used to have a bff ( lets call her anNie) .soo me and annie chat on fb alot.so one day someone hacks into my account and calls her a bad wrd. soo we have like a group of people and ever since that happened the group turned agaunst me!! ugh!. soo here is the actuqwl drama! Now there is a girl named ( lets call her grace) soo gtsace hears about the facebook thing and now iis trying to destroy my whole life!! she steals my friends coppies my styles sand takes credit ... now she islying and telling ppl i tlk crap about them! im obnly in sixth grade and my new bff is caleed jamie! now grace is trying top gert jamie to leave me!! jamoe isnt going! yay! but i dont wanna tell on grace! how do i defeat grace??