Hi Ken, Cemetery information is generally found in a person's obituary or death certificate.
There are only two obituary volunteers for San Joaquin Co. Go to freepages.genealogy.rootsweb.ancestry.com/~obitl/volca.html Scroll down to San Joaquin Co. and choose ONE volunteer at a time.
There is a list of San Joaquin County Cemeteries at cagenweb.com/archives/Cemetery/SanJoaquin/SanJoaquinCemeteries.html .
The San Joaquin Genealogical Society, rootsweb.ancestry.com/~sjgs/index.html might have more information about cemeteries but they do charge a fee for doing research.
You can request a copy of her non-certified death certificate from San Joaquin Recorder/County Clerk's Office, www.sjgov.org/recorder/dynamic.aspx?id=10793 . Be sure to ask them about what information they mark out (redact).This document will have her burial information. Successful Searching!