Did I stumble upon it?
I am able to locate Etheldred in the 1830 and 1840 U.S. census for Twiggs County, Georgia. Twiggs is next door to Bleckley (which was created in 1912 from Laurens and Pulaski counties), so that's not a far stretch. Too bad I didn't find them in 1850.
I found only a couple of references to Malinda's birth and death dates. A birth year given was 1795, and a death year given was 1833. That doesn't exactly jive with the dates of about 1790 and 1857 given on the stone I found.
I don't know if I did or not, but it would be pretty cool if I stumbled upon the "lost" burial location for Malinda Burton, wife of Etheldred Griffin. Maybe someone will stumble upon this blog post and let me know if I'm crazy or not.