3) Write to the library in Indianola with a SASE and a small donation.
(If you post on both boards, mention the fact you have done so, to avoid two volunteers duplicating efforts.)
If you get an obit and if it mentions Celia in the "survived by" list, you will know what her married name was and where she was living in 1993. That may be enough; it may not. People move around, get divorced and remarry.
If she is listed, you could try a post on the county forum for the county she was living in back in 1993.
There are a couple of big IFs here and no certainty. I wish you well. Don't get your hopes up.