Am I wrong for asking her to repay me the money I'm out for her wedding????

I was a bridesmaid for someone that I considered a very good friend. As her bridesmaid, I hosted one of her multiple bridal showers. I also purchased a dress that she picked out from an online wholesaler, and paid for alterations, shoes & accessories. Well now 2 days after the shower, my "friend" comes up to me & says that I'm no longer needed to be a bridesmaid. Her hubbys friend isn't going to be coming,(groomsmen) therefore there is no need for me. Because of the seating arrangements I'm also no longer invited to the wedding. (I would have been sitting at the attendants table if I were still invited) Because I'm no longer an attendant she can't add chairs to the already full tables. I feel that I was used. I asked her to reimburse me for my expenses. She said that she is not paying for items that she didn't purchase. I think she should at least pay me for my dress ($250) if not anything else. Is it wrong for me to feel that I should be compensated. I cant even attend now!!