Mean Girls problem?

[751]

I study in a small private school, and im my grade there are just 9 girls, including me.
1 of them has super-religious family. They dont allowd her to go to the mall, someone's house, invite people to her house, etc.
2 of them dont have personallity, they copy everything
5 of them were cool but them they converted into mean girls.
I decied to stay away from everyone and im okay in this way, i eat with my best friend (whos a guy) his friends and my guy friends from other grades i dont feel bad or nothing.
The thing that was bother me was the thing that 1 of the girls talk really bad about me, saying that im a b with an ich and that im fat and i dont have friends and stuff like that. i know that noone of those things affect me, anyway.
But yesterday the girl sent me a :* thought her friend's facebook, i just answered with a boring smiley-face
and today i post a pic in instagram and this girl put something like i love your hair.
I know that she hates me, and she hates my best friend too.
What should i do?

[Rosa]

Well this is what MIGHT happen, and this is only my assumption so yea. It seems like if you continue to ignore her and not acknowledge her she will start to make up rumors about you. I think what you are doing now is cool, but to avoid that just throw her a little shitty response. like thanx. or something