Fired Bridesmaids

I have this "good friend" who recently stood as my Maid of Honor. When she became engaged about 2 years ago, I was invited to be her Maitron of Honor since I would be married by the time her wedding rolled around. A month before my wedding, her brother got married. Since then she`s invited her new sister=in-law to be the Maitron of Honer and has yet to tell me I`ve been fired. Do I attend her wedding when it occurs later in 2004 or do I not go. I would like to go because I am her friend, but after this, I somehow see she feels differently about me. I should add that we still speak often and haven`t had any disputes. Her behavior is cowardly. Should I be passive and go or quietly make plans on her night to do something else?