I've never cared what people think of me, I make my own reputation, if people talk bad about me, eventually others see they are being stupid and ignore them. Life is too short to let some child ruin things for you, ignore and it'll go away.
All you have to remember is that you are better than them.
I also believe in karma, if she's talking crap about you, eventually she'll get f**ked over herself!!!
Keep your chin up!!!