I have had a look at the civil births and some of the Clare baptism registers that are online through the Clare Library website. So far, I have found a Patrick Collins in Tullagower (Killimer parish) with children baptised to a Patrick Collins and an Ellen McInerney between the years of 1857-1872. I'm giving you the link and you might have a look at that particular register if you think it's a possible match.
If there were other siblings that joined Mary, it may be worth looking at the above parish to see if they match with that family.
If you have any further information that you would like to share, please let me know