Background story: My fiance and his parents have been friends with another family for three generations. They have a daughter my fiance's age who grew up with him, and they basically consider each other brother-sister. However, his positive feelings toward her have gradually faded as she's become increasingly more abrasive over the years (as has her family). Drama queen is the biggest understatement ever - this girl brings full blown anxiety to anyone she's around.
Right after we got engaged, my fiance was super excited about, well, being engaged, and in his excitement asked both her and her husband to be in our wedding party. They were both super excited and accepted. However, it's come to light that she has been saying some untrue things about his family (something she has a tendency to do), and now her family is so upset with his family that they are threatening to not even come to our wedding. I hate to admit it, but it would make my life SO much easier if she weren't in the wedding party. First of all, I'm getting married in a small country chapel, and I've seen how 9 bridesmaids and groomsmen look at the front -- it's very cramped (so much so that the 8th and 9th have to wrap around the sides of the chapel). Secondly, my mom and wedding planner are pressuring me to have a smaller wedding party (it sits at 10 with her in it), and my fiance only has 7 (six if her husband is un-asked too). And lastly, my fiance's family is concerned that she is such a type A, abrasive, in-your-face loose cannon that she will not only make my wedding day (and events leading up to it) extremely stressful, but will also potentially continue to smear my fiance's family after she gets a few drinks in her.
How can I or my fiance politely un-ask her to be in my party? I didn't even want her in it in the first place, but understood why my fiance asked her. By the way, my fiance 100% agrees with me now and regrets jumping too fast to ask her.
Thanks!