FRIEND TROUBLE! WHAT DO I DO NOW!?

Shes not really a good friend if she says those bad things about. Act like you don't notice her and make other friends. Then maybe she will get jealous and then she'll wanna be friends. or you can apolgize to her. Or buy her something nice just to show her that u do care about your friend ship. Tell her that you were makeing fun of her in a friendly way just like she did with her other friends.