Need to vent

So last week one of my bridesmaids dropped out (wedding 10-31-20), claiming that she cant afford the dress (I have a few bridesmaids on a budget $150 was the most expensive dress) and doesn't want her wife paying for her stuff. I offered to pay for her dress and I told her there was time and we could get it. She still said no. Fast forward to a couple days ago she posted on social media that she couldnt wait to get her nails and toes done. I was livid! First off before ANYONE says that my wedding isnt priority I KNOW! I get it as women we ALL love having our nails and toes done (im a practicing cosmologist i understand the need for it) but when you come to me and tell me you cant afford your dress AND you dont want you wife paying for it (her wife is my FH's sister) makes NO sense to me at all cause I know that her wife will be the one paying for her nails and toes to get done BUT she cant afford a dress (also i picked out dress that they could pick to wear MORE then once). I may be coming off as like a witch but, I am hurt. One of my other bridesmaids has a child who has autisim and her and her husband are VERY tight on $ and she has to not only get her dress but her daughters as well (her daughter is a jr bridesmaid) but they are still in. Her nails and toes are gonna cost her somewhere in the $75-$100 range (thats with tip too). I am kinda hurt by this. Like I wanna say something to her about it, but i also dont want to be THAT bride, you know. I have been told that I have no reason to be upset and that I need to understand this and that . I DO!!!!!!! I get it!!!! But if you are having your wife pay for your nails and toes why cant we split the dress 2 ways? Her wife pay half and I'll pay the other half. She is also doing my makeup for the day and I am going to pay her (that was never a question). OK sorry vent over.