Hello Mary A.
I suppose she could have, but the honest answer is that I do not know! I can only suggest that you check the parish register for Malew for the marriage. It may include Mary Ann's one of Mary Ann's parents or siblings as a witness. If you are lucky? and Mary Ann and her husband lived on in Malew, then their burials and ages at death may be recorded in the Male burial register. Or, you may find them in the 1851 Census returns?
Sorry I can not be of more help.
Bob