Curious indeed. Does the Church entry shed any additional light? It would be worthwhile looking to see if that priest had married other widows and used ‘formerly’ after their names. Also, were there children from her first marriage? I’d look for baptisms with the mother’s name Bridget nee Smith from that townland, 1845 – 68 (assuming her age and the usual two years of widowhood). That might throw up a possibility / narrow the search. At 44 she has less than a 2% chance of becoming pregnant and a less than 50% chance of carrying to term, so post-marriage date it’s unlikely that there was a birth.