Hi Cheri, You can request a copy of her obituary [if one was published] from Random Acts Genealogical Kindness. Go to raogk.org, read guidelines, choose California, choose Alameda Co. and choose one volunteer.
If the obituary doesn't mention her cause of death, her death certificate will. You can request a copy of her death cert from Alameda County Clerk-Recorder, rechart1.co.alameda.ca.us/ . Successful Searching!