Bridesmaid dilemma

So I have 6 members of my bridal party, one Maid of Honor, One Matron, and 4 bridesmaids. So far everyone has been great and I haven’t had issues for the most part, but I was a bit wary before asking one of them to be a bridesmaid because she can tend to be a bit flakey. Mind you, before I did a “proposal” to her to officially ask, I gave her a disclaimer to see if she could manage it, and she assured me she could. So I asked her.


Well all my party has known since July that they were part of the wedding, and told to save accordingly. Well. My maid of honor was texting the girls to get the money to book the location because she was going to have to pay the $1500 out of pocket and get reimbursed. Before the price was even on the table, she gave everyone the option to pay half now, and half come July or to pay it all up front. Between all the girls that would have been $252 total per person. ALL the girls agreed to pay full price and just get the payment out of the way. Mind you, during this whole process, every group text where we take a group consensus we always have to specifically state her name in order for her to even reply to a text.
So breaking it down, this bridesmaid agreed to pay the full price now. Then when the money needed to be paid, now she doesn’t have it because of the holidays, but then she told me that she had just paid for another bachelorette party. Sooo the story didn’t necessarily add up and she lied about my MOH offering the half now/later option.
Now she wants to back out of the bachelorette party, but still be part of the wedding. So at this point I don’t know what to do. I don’t necessarily want to offer to pay for her either because if I start offering with the smallest cost of this obligation, then she’s going to expect it for every other aspect as well.
I just need some advice because at this point I don’t want to be a bridezilla, but I also want someone who actually follows through with what they agree to. I do understand money is tight and that the holidays did just happen, but then she shouldn’t have agreed to pay the full price either when it was first mentioned.