Is it ever okay to decline a request as a bridal party attendant, after you've accepted the offer?

It really is flawlessly fine. I was asked by my step-cousin to be a bridesmaid in her wedding in November 2009. I made the decision I did not want to commit to some 希臘婚禮 thing so far away and I wrote her an email explaining Okinawa wedding that it wasn't individual, I just was not interested. I did not get into detail why and she is ok with it. Her mom, on the other hand, is attempting to get me back but I informed her no, I will not want to do it. I am an grownup, i make my very own decisions. End of story.