Bridesmaid non existent

I have no idea what to do. I need someone to tell me if I'm over reacting or not. Okay, so I have this bridesmaid that literally cannot afford anything. I have been paying for everything for my bridesmaids. The only thing I asked them to do was buy their dress and I will provide everything else. I have paid for their hair and makeup and various events. I set a deadline for the girls to buy their dresses and told them if you don't have your dress you can't go to the bachelorette party. Which I felt was fair. A week before the deadline she texts me asking if I can pay for her dress or help pay for it. I told her no I couldn't you had months to know you needed to pay for this dress, so better planning needed to be on your part. I had a discussion with her saying if she can't afford to be a bridesmaid please tell me now so we can figure this out. She kept saying yes I want to be apart of your day, blah blah blah. Regardless of this, she is not a friend at all. She doesn't text me back, she gets mad when I ask her questions. When it comes to being a friend she isn't there emotionally. She had a lot of going on and I understood but she hasn't changed her situation so now I feel like she likes being in those situations. She rsvped her plus one her on again and off again boyfriend that hates me. I felt that was so rude and I just don't even want him to be there. I had someone suggest me that I should buy her dress from her since she already has her dress so I can buy her way out of the wedding. Like I am constantly thinking about her and what she may be going to do next and I'm not having fun. What would you do? What should I do? I want her out is that wrong of me?? All comments wanted please!