Bridesmaid trouble

Okay ladies, I need your opinion. I have nine bridesmaids, and I love them all to death. But I’ve noticed something with one of them.

Back story: this girl has been one of my closest friends throughout high school. She lived across the street from me, so we were basically inseparable. Once I graduated I moved a way for a while, but I still made time to see her whenever I came back. I’ve helped her through some pretty tough times with her two daughters father abandoning them, I have put a roof over their head, food on their plates, and gas in her tank. She refuses to get a job, so now that I am getting married , of course I would ask her to be a bridesmaid. She joyfully accepted. But since I have asked her, she doesn’t ask me to hang out with her anymore, nor does she even try to talk to me unless I message her first. I asked her about a month or two ago if she still planned on being in the wedding since she hadn’t gotten ahold of me, and she removed herself from the bridal party group chat, as well as hasn’t come to any of the important things. (I asked her to come with when I found my dress and that she could bring her daughters and she told me she would, but came up with a crappy reason THAT DAY as to why she couldn’t come, even though I had a ride planned out for her). She told me she still wanted to be in the wedding but she doesn’t have the money to purchase the dress I found. It’s off of amazon and only $80 with shipping. I want her to be in the wedding but I know she is expecting me to help her out again since I’ve helped her out for so long, but I can’t do it. I don’t want to (nor should I have to) pay for her dress, especially since I have an entire wedding to plan and pay for. What would you do if you were in my shoes? Please help!