Searching forward for a possible marriage etc for Brigid could be difficult unless you already have some clues as to who, and where, she married. You would probably also need her father's name and occupation to verify, or rule out, any possible marriages. Are you a descendent of Brigid ?
To search back in time the first step would probably be to search for the same family on the 1901 return to establish the Annie's husband's name. Next search for Brigid's birth to establish her father's name and mother's maiden name. Using this information you can then start a search for her parents marriage.
see :
Introduction to Irish RecordsShane
