Best friend is choosing her fiancés family’s wedding over mine

This may be a super stuck up bridezilla moment but I’m frustrated. One of my best friends has just told me that she isn’t coming to my wedding because someone in her fiancés family is getting married the same week all the way across the country. The kicker is; she used to be a bridesmaid, until her cocky attitude, flakiness, and self absorbed personality got her kicked off the island. I’ve had my wedding date set for almost two years, definitely longer than the other couple and I have know her longer as well. I’m confused on what to do and say as I’m very hurt.