One of my bridesmaids has gained a bit of weight since purchasing her bridesmaid dress, and it no longer fits her. She told me she needed to get a new one, and I told her I understood and said she should see if she could return the original dress since it had never been worn. She said they wouldn't accept the return since it had been purchased more than 30 days ago, and then she asked if I would buy her new dress since she already had to pay for her first bridesmaid dress. I understand that if I had been the one to change the dress she was wearing that I would be responsible for footing the bill, but is it my responsibility to pay for her new dress since her old one no longer fits her? I'm unsure how to approach the subject and say that I'm sorry, but I can't pay for her dress because it's not in my budget. Am I being unreasonable, or should it be her responsibility to pay for her own alterations or a new dress? Thanks!