Bridesmaid Issues...advice?

One of my bridesmaids used to date one of the groomsmen (it was a long relationship and he is not handling how it ended well) My fiance and I are much closer to the groomsman and see and hear from him more. My bridesmaid acted super excited at first and now I don't really hear from her and I've seen her twice in six months & she has ditched hanging out with one of my other bridesmaids more than once , but she has messaged my MOF once about helping with the shower so she made an effort. My fiance and I already made the decision that her current "friend" will not be at the wedding as he was the best friend of the groomsman and they are not on speaking terms after she left. I am not sure I want her at my wedding anymore because I don't feel like she will be around in a year or makes an effort in our relationship and I also want my groomsman to enjoy himself at our wedding without her presence weighing over his head..Advice? Am I wrong to not want her in my party or even at my wedding?