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.