1900 Federal Census - Michigan - Iron - Crystal Falls - District 0075
Berna Shafer widow 65 born Jan 1835 in NY
This record shows that Berna is the mother of 1 kid with 0 kids still living.

The information for the 1900 Federal Census was collected on June 5, 1900
She married her 2nd husband on Aug 29, 1900

OK - She died in California but was sent back to Michigan to be buried with her first husband.

Have you contacted the Pasadena, California public library
or the Dickinson County, Michigan public library ?
They would have back issues of the local newspapers

Have you contacted the Pasadena, California Genealogy Society
or the Dickinson County, Michigan Genealogy Society ?
Maybe they might have a volunteer who can help you to locate an obit.