It was my understanding that, in traditional Western weddings, if the bride were to become unavailable on the day of her wedding then the groom was expected to wed the maid of honor or the next available bridesmaid, thus precluding married women from serving as bridesmaids.
In Western tradition, there are several positions that a woman can take in the party of the bride: she can be a bridesmaid which means she is any of the attendants, a maid of honor if she is the principal unmarried bridesmaid with more duties, or matron of honor if she is the principal bridesmaid who is married. A maid (or matron) of honor is different from a bridesmaid:
Times certainly have changed, and the tradition of bridesmaids needing to be unmarried no longer holds. This Q&A on The Knot said:
The definition of bridesmaid is:
By definition, a bridesmaid does not have to be unmarried. Further, in common practice, a bridesmaid need not be unmarried.
After simchona clarified what exactly was the problem, I looked it up, in Bride's forum, and someone asked a similar question:
Three of the answers all agreed on one thing: