Fiancé's aunt.

So my fiancé's aunt was bugging us about going to srs. And I told her we haven't. Then she asked why, so I said I can't force my fiancé to go if he doesn't want to. Then she said this stuff. To me she crossed the line. She never liked me. But I don't get why, I've always been nice to her. Well our wedding is in September and I told my fiancé that I don't want her coming. Cause if she goes I want her to be there to support ME and my fiancé. And well it started a little bickering. I don't know if that's the right thing and I really don't know how to handle the situation. I told him that I'm not going to be around her with that kind of negative impact on me and I don't want my daughter around her.