I may have some information for you, I'm not sure if we're talking about the same family but here's what I have so far:
My great grandmother was Catherine Ahern(Ahearn). She married Patrick Callahan and gave birth to my grandmother, Bridget (1895-1970) in Dingle, Ireland. I don't know anymore as to when she came over except that she married James McPadden in 1917 in Springfield, Mass. My dad used to tell me how she constantly talked of the old country. I don't know if she had siblings, where she really grew up or how she met my grandfather. I have recently found out that she went by the nickname "Bessie". Please write back as I feel we may have some sort of a match!