Aw, I'm sorry. I think you should sort things out with her. Just tell her that it bothers you when she jokes around like that. If she doesn't apologize or stop, then she isn't a good friend and you don't need someone in your life who makes you feel bad about yourself. You don't need to stoop to her level and insult others. Be the bigger person and try to make amends.
If she doesn't stop, then at least you tried and she'd be the one at fault, not you. You shouldn't feel bad after that. Hope this helps you a bit.