Ford' in Ireland came from Cork County. There were a few in other counties in Ireland. There is a break down of how many Ford's in each county in Ireland.
Irish people are for ever having nick names. They also have many generations of the same name. Make sure you look at the Irelans web sites besides looking up census, immigration records, ship records, and anything of news, church, court, property, and so forth along with any libraries in those towns.
There are a couple of Mary Ford's.
One Mary Ford (maiden name)
married Owen Carolan. WWI Veteran.
There was another who in a news paper could of been another Mary Ford.
The one you might be speaking about could be interesting. Hum.
Take a look at a married name also.
There is so much information that I could tie this question for ever.
Hang in there.
Isn't it wonderful doing reseach!