A. If you’ve done all your searching online thus far, don’t worry about being stuck: You still have plenty more avenues to explore.
If your great-grandmother had a Social Security number, she may appear in the Social Security Death Index, or SSDI (search multiple versions of this database simultaneously from Steve Morse’s One-Step site). The SSDI lists the deceased’s last residence. Whether or not she’s in the SSDI (the index was computerized in 1962, so most deaths it contains occurred after that), though, if she had a Social Security Number, you can request her SS-5, or Social Security application, from the Social Security Administration.
Check Great-grandma’s hometown newspapers for obituaries and death notices in the time frame you believe she died. You can identify newspapers published during that time, and which institutions have them on microfilm, at Chronicling America. Remember that she may have remarried and changed her last name, so look for marriage announcements, too.
Try to request a death certificate from the vital-records office of the state where you think she died. This may be the state where you last have a record of her, or a state where one of her children lived. Every US state was issuing vital records by the 1920s, so you wouldn’t need to know the specific town or county to get the record. See the National Center for Health Statistics’ Where to Write for Vital Records website to learn the address, fees and ordering information for each US state.