Would this be her?
Social Security Death Index
Name: Mary Kirnan
Date of Birth: Thursday March 01, 1888
Date of Death: September 1973
Est. Age at death: 85 years, 6 months
Last known residence:
City: Morris Plains; Greystone Park
County: Morris
State: New Jersey
ZIP Code: 07950
Latitude: 40.8475
Longitude: -74.4826
Social Security details:
State of Issue: New Jersey
Number: 151-42-6859