All you have to do is not respond. Be the bigger person and you'll all be happier in the long run. To be honest I think she's just playin' and it's fun for her when she gets a reaction out of you and you respond. I'm not justifying what she says, I just want to make sure you don't take it to heart. :/
Meh, I'm not to special. I'm just an average person. All I wanna do is live a normal life, raise a family, fall in love, and share my happiness with those I love.