That is a tough situation, but one you knew would happen sooner or later during the wedding planning. Personally, I would invite her. Put the decision on her, you are going to be so busy with everyone else and if you don't she will show, at least you made the effort. If she does come, it shouldn't make that much of a difference, you don't need to cater to her, just have a good time, say hello, and remember it's your day.