Mary (Loftus) Bigelow is listed in the California Death Index, with the following information:
Name: Mary Eva Bigelow
Event Type: Death
Event Date: 15 Oct 1958
Event Place: Sonoma, California, United States
Birth Date: 23 Sep 1882
Birthplace: Nevada
Gender: Female
Father's Name: Loftus
Mother's Name: Macauliffe
Citing this Record
"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VGTV-LGG : 26 November 2014), Macauliffe in entry for Mary Eva Bigelow, 15 Oct 1958; Department of Public Health Services, Sacramento.
If you get a copy of the death certificate (it will cost $19 from the Sonoma County Recorder in Santa Rosa, Calif.), it will apparently answer your question.