When she called I didn't talk to her. She left me a message saying that she wanted to talk about school that she was in a bad mood and she was having problems with school.

It's like she's acting like nothing happened. Seriously. Ever since they both started acting weird about putting a deposit down and all, I tried talking to her whether on the phone and face to face, she would change the subject and blow it off like nothing. So even if I did tell her how I felt, it wouldn't matter. But after she said "no we aren't going it's just not happening" I tried to give her options and a chance to change her mind, but she blew it off and didn't consider anything. So, I don't plan on talking to "her" ever again nor does my fiance plan on talking to "him". As far as the BM dress goes, the store does not do exchanges, refunds, returns, etc. BUT, I might have lucked out and found a girl to take her place, but we'll see. Regardless, this was a really shitty thing to do and I can't believe that my best friend, someone I considered to be like a sister to me, did this to me. Out of everyone attending my wedding and being part of my wedding she was one that was important to me and one that I cared (past tense) the most about being there. Well it will come to bite her in the a** later. Don't think I'm going to her wedding if she ever has one and hope she doesn't expect me to be there for her when she needs someone when no one else is there.
THANKS GIRLS!!! It sucks to have things like this happen, but it does show who the true friends are and shows everyone's true colors. And I completely agree with everyone's thoughts as I have been thinking the same exact things! =)