Thank you for that. The mother's name is Martha Johnston Bensley, b. around 1831-32 in Augnacloy,Co.Tyrone, Ireland.
Possible date of death is Aug 1922. I'm not sure if this makes a difference to the search but Martha's maiden name was Johnston and her first husband's name was Johnston also.
3 States where she may have died are Pennsylvania, New Jersey and New York. She lived in all 3 states during her life.
Her daughter's name is Mary Ann Johnston Decker, B. abt 1858 in New York. She also lived in the same 3 states as her mother. Her last known address was 21 Grant Street, Newark, NJ.
Mary Ann lived here from 1924
Hope this helps with the search and thank you again