Bridesmaid troubles

Has anyone else had difficult bridesmaids? My grooms sister was the first person I asked to be a bridesmaid and I made a cute proposal box including a $40 robe. She was so excited and happily accepted only to back out a month or so later claiming she didn’t feel like she fit in well enough with the other bridesmaids. I was very sad and started thinking about what if the others did the same thing to me. I ended up asking a coworker who I’m very close with to take her place and I’m so glad I did! She has been wonderful so far. Then I got more bad news... my matron of honor and flower girl will not be coming home for me bridal shower/bachelorette weekend and also her husband (a groomsmen as well) will not be here at all for the wedding due to the Covid virus. She says she will be here for the wedding but I worry she will not make it as they have missed many important events they promised to be here for. I decided to promote a bridesmaid to maid of honor and pick a new flower girl as well. This seemed to upset my matron of honor as she says they will be here for the wedding. I told her if she makes it home she can still be the matron of honor but she will share the title and there will be two flower girls. I am hoping nothing else goes wrong before the wedding! Has anyone else had similar experiences?