Bridesmaid frustration

I'm writing this as more of a vent. I have 7 bridesmaids, 3 sisters & 4 friends. Some of my choices and some are becoming frustrating.
By no means do I think the next 5 months should be ONLY about me and my wedding; however I have been frustrated with one friend who refuses to talk wedding with me and changes the subject every time, and has not once asked about wedding details and has yet to buy her bridesmaid dress, although everyone else has.

One of my other bridesmaids moved out of state, halfway across the country, in the midst of planning. She was originally here and helped me pick out flower girl dresses and was very supportive. I told her not to worry about flying back for any of the "events" other than the wedding and even told her that I would understand if she could no longer commit to the wedding. She continued to state that she will be flying back for my bachelorette party and wedding, even though I've told her that I would understand. So, last week we moved forward with planning the bachelorette and booking a budget friendly Airbnb for the group of us that agreed to go. (No one was obligated, everyone voluntarily agreed and their budgets were requested personally by myself and related to my MOH so that we could respect their budget.
This weekend my BM texts that she can't come because she doesn't want to come back to this state yet. Even though my bachelorette is not where she originally lived in the state. I am frustrated with her reasoning as to not coming as well as her deciding immediately after the Airbnb has been booked. Now I'm questioning if she will make it to the wedding, as a part of me isn't sure that she won't back out at this point at short notice. Again, I know she is not obligated to come to my bachelorette, some of my others are not coming, which I totally understand.
Lastly, my sister and MOH has been frustrating me. I asked all of my sisters and mother to attend me trying on dresses on Saturday that's not a few weeks away. They all agreed to it and we planned after checking everyone's availability. Now, my sister has called and said she will be bringing a new boy (that she's not officially dating, as she has been dating around up until this very week) to meet the family that day. While the boy will not be at my dress try on, my sister and mom agreed that we'd do a dress try on as well as some other planning and fun things together. I'm frustrated that not one single day can be about my wedding dress try on. She also has asked to change the date of my bachelorette party as this man will be leaving the area a few weeks after my bachelorette and she would rather go when she is not here. (She's my MOH & wants to be in charge of planning it all).
While I know that every single day should not be about me and my wedding, I feel as though some of the people in my life who are supposed to make it the best are not doing that.
I am blessed with a handful of exceptional bridesmaids, but I'm getting frustrated about the others.