Thanks for the post!
FYI-It is the right lady, but the record is wrong. She was "Mother" to neither James or Nellie. She was Nellie's aunt. Nellie's mother (Julia (Cavanaugh)Hatch)died a month after Nellie was born and the clues suggest Nellie came to know Johanna Bridget (Cavanaugh) Crew as Mom. More info than you needed - sorry.
I have been chasing her done for months, but only recently discovered her first name was Johanna, she goes by Bridget on many other records. She was my great grandfather's sister.
Thanks again.