I'm wondering if the birth record that Mary found is the right Gwendolyn McDonough. Putting in that birthdate with the given name of Gwendolyn turns up this entry in the Social Security Death Index.
United States Social Security Death Index First Name: Gwendolyn Middle Name: E Last Name: Lawler Birth Date: 25 September 1916 Social Security Number: 564-01-7742 Place of Issuance: California Last Residence: Carson City, Nevada Zip Code of Last Residence: 89701 Death Date: 29 May 2002 Estimated Age at Death: 86
I can't find an obituary for her but did find one for her father.
Reno Evening Gazette, January 5, 1972
Edward McDonough Edward J McDonough, 81, of 341 Abbay Way, Sparks, died Sunday in a Reno hospital. A native of California, he had resided in Sparks for six months. He was a retired carpenter. Surviving is his daughter, Gwendolyn Lawler, of Sparks. A private funeral service will be conducted in the O"Brien Rogers and Crosby Funeral Home.