Bridesmaids not participating

Help, not sure how to handle this situation Let’s start by mentioning that my wedding is in 4 months.Two weeks ago I scheduled an appointment for my bridesmaids to go look at dresses. I told them the color and the length etc, but I gave them the choice to chose different styles as long as they’re pretty much uniform like. One of my friends, let’s call her Ana didn’t show up because she had a family situation and she did let me know ahead of time. Another friend, let’s call her Sara said that she wasn’t sure if she could make it, but ended up showing up. At the appointment there was a lot going on, they didn’t really like the dresses I recommended or the fabric,etc. So i ended up scheduling an appointment at Davids bridal for yesterday . I told them a week before about it. At the DB appointment, only 3 of the girl’s showed up. Ana once again didn’t show up or texted me she couldn’t make it. I haven’t heard back from her yet. Sara came in 20 mins before the appointment was over and didn’t even apologize or seemed interested in trying on the dresses. Also it turns out that my color was one of the ones that take longer to come and will arrive after the wedding so now i have to look somewhere else for dresses or chose a different color. So once again I had to schedule another appointment. 3 of the girls that showed up on time actually found dresses they like, but they’re just waiting on me to tell them the color or what the plan is. I told them by next weekend I will make a decision and that I would like everyone to be on time and show up this time. Sara didn’t seemed to like that, so she immediately walked out bc she “had things to do”. To be honest I don’t know how to ask her and Ana if they still wanna be my bm and if they’re willing to participate because I don’t feel like I’m asking for too much. I’m giving them the choice to pick different styles and not wear the same exact dress. My wedding is so soon and it’s stressing me out bc I feel like 3 bm appointments is too much and it shouldn’t be this hard. They accepted to be my bridesmaids and honestly the only thing they have to do is find their dress and show up to rehearsal dinner and on the wedding day, it’s pretty simple. So I don’t wanna lose a friendship over this but it seems like they are not involved in this or seem to care. The rest of the girls I’m not too worried about they’re fine with whatever. My wedding is coming up in June and I don’t want to spend too much time with this situation when I have a thousand other things to do. Any advice on how to talk to them about this would be great.
Thank you