Bridesmaid frustrations

Hello fellow brides, I’m taking a leap of faith here and I hope someone can offer me some good advice! I’ll try to keep this as short as I can.
Okay so basically I am having some really strong frustrations with one of my bridesmaids about ordering her dress. Back in December 2018 I picked a dress off Amazon that we hoped would work out (it did NOT). Fast forward to January 2019, I decided on a dress frim David’s Bridal. So, there has been a lot of dress talk for the past 2 months. I have a special group chat on the Group Me app for my girls, if someone doesn’t respond I always reach out to them personally to make sure they saw it. I’m on top of the communication here! I gave my girls the deadline of the 1st week in February to order. All but 1 of my 6 BM have either ordered or made arrangements with me to order their dress by then. My one BM is really starting to frustrate me because I can’t seem to get any info from her on when she is able to order. I have asked her SEVERAL times on what her timeline/game plan was... she is very vague with answers (if she even answers me at all). My most recent attempt was Friday afternoon, I sent her a simple text just asking when she planned on ordering, she never responded but she was posting on her socials throughout the day. So last night I texted her basically saying “hey I know you’re busy and I know money is tight but I really need to know when you plan on ordering because we need to make sure it comes in time”. Nothing. So, I texted her this morning basically saying the same thing but more on the fact that she is starting to really hurt my feelings because I feel like she is ignoring me and doesn’t care about being in my wedding anymore. And that if she cannot financially commit that I need to know so I can find another BM in time. She wants to be in the wedding but “literally has no money”. And where I am getting extremely frustrated is that I see her on her socials constantly going out to bars, getting her nails done, buying this and that, getting her eyelashes done. Just two weeks ago she spent $100 on her hair, she literally bragged about it “only” being $100 (the dress is $95 I may add). I know it is absolutely none of my business what she choose to spend her money on, but I don’t think it’s valid to use the excuse of not being able to pay for it when I literally see her blowing her money all over the place. AND the fact that she’s known about this since December. I don’t know what to do, I’m trying to be understanding and not bring up her spending habits. At what point do I draw the line? Am I crazy? How do I get it across to her that if she does not order that she will not be in the wedding?SOMEONE PLEASE HELP ME.