Sacked as bridesmaid

One of my best friends and her FH have advised me that due to cost cutting measures I am no longer required to be a bridesmaid. She is still having 3 bridesmaids instead of 4. I feel that in the grand scheme of things that the 250 dollar cost of the dress is not that big of a deal when the wedding will be costing them 30 thousand dollars approx. We had no falling out and I do a lot for her. More than she ever does for me. Am I right to feel hurt by this or am I just being selfish? She blurted all this out after a bottle of wine as though she was building up the courage to tell me. I was asked 4 years ago but the wedding the date for next summer was just set. Dress hasn’t been bought yet but my gift to them would have been more than the cost of the dress. The cost of the dress wasn’t discussed but I would have payed for it myself as would the rest of the girls. She informed me a week ago I was no longer required but apart from sending me a couple of Facebook messages about other subjects she hasn’t mentioned it. I am still invited to the wedding but It’s embarrassing having to tell friends and family I am no longer a bridesmaids. I feel so hurt. What do people think?