Why don't you start with what you know. She died in California: the logical thing to do is to obtain a death certificate. So you have the death certificate: get the newspaper obit from a San Francisco Newspaper. You have the date she died. It will be contained on one roll of microfilm probably with the California Historical Society Does the newspaper say where she was going to be buried? Does the newspaper say where she was born or where she lived? Bet you that she was buried in the community that she was born or married in. Let me know your results/