A great granddaughter providing info to the funeral home, for a woman who died at 55? Seems unlikely. I wonder if Mrs Sherman was a daughter-in-law, Mrs Sherman Ellison, and her name was recorded incorrectly? Sherman and his wife Irma did live in Winnemucca in 1930:
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XKJL-CNZ : accessed 24 July 2018), Sherman Ellison in household of Allison W Lovell, Winnemucca, Humboldt, Nevada, United States; citing enumeration district (ED) ED 11, sheet 12A, line 24, family 356, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1296; FHL microfilm 2,341,031.
There might be a California death certificate, but most likely the same person provided the info for that. Maybe worth a look anyway.
Also, since the marriage exists in index databases, there might be a marriage certificate on file in Hamilton County. You would have to look up how to order one. Sometimes they have family details, sometimes not. From what Wendy said, a birth certificate sounds impossible. Another possibility is birth or wedding announcements in the local newspaper. Local genealogical/historical societies usually have things like that, but usually you have to show up in person, old school. Good luck!