Thank you both so much! You are too kind.

You know it's funny, my Mom grew up in her grandmother Kate, Hannah's daughter's household. So, from age two to age 22 she was with her, yet she's told me that she doesn't know anything about her great grandmother Hannah because they just didn't talk about things like that back then! It has made me so curious about her life prior to coming to the US.
So, I don't know whether Hannah came to the US with family or not (my gut tells me not) and she was never naturalized so there are no papers for that. I did find a few Hannah Morrisey's on passenger lists, so I should take a look at those again.
Ballydw, I do not have a copy of her death certificate, but will order one. I have copies for some other Irish relatives who came to Maine and only Ireland is listed as birthplace and not much more, but it is worth a shot if her mother's maiden name appears. She predeceased her husband so there is a chance of that. Thank you for the suggestion.

Padraig, I had seen Ellen Riordan's name associated with John Morrisey, but now feel more confident with your research that I was headed in the right direction. Your noodling has provided me with some wonderful information and greatly reduced some of my frustration! You have been extremely generous. I can't thank you enough for following the trail. I will investigate the links and order some certificates as well.

Take Care,
Judy