If "find a grave" doesn't work, you may have to write for her death certificate. They usually have the name of the cemetery or funeral home on it. The funeral home will know where they buried her.. . If you know her date of death, you can look for her obituary or death notice, in old copies of the newspaper at the library. They may tell. Try for a small local paper, not the NY Times.. . If you remember the name of her funeral home - or your parents do, and they are still alive and talking to you - call the funeral home. They keep records.