Did your try the obituaries in newspapers for that date? Also, is funeral home noted on the death certificate?If so, call them and ask for any information.They may have a phone number of heirs.If the cemetery is listed, call and find out who owns the plot.There should be phone numbers of the people that buried her.Also, check everyone in the adjacent plots, they may be related. If so, you may be able to see by the tombstones who her husband/siblings were.One of the cemeteries in Wisconsin has been saving the death notices for years, she pastes them on the back of the file card for that person.
My Gaved's were from Redruth, Cornwall, England.It is Cornish name and most likely the male Gaved's were miners. Check any mining newspapers or area's around mines to see if you can find that name.It is very rare, so if you do find it, you should find some other family as well.