I'm sorry if I added any more confusion to one of the more difficult lines of my genealogy.
In my website www.Geneal.net I simply put the indirect sources that refer to Lucy Sandridge Keaton. These are books that I accessed in the Cabell Co Public Library while on a genealogy visit to Huntington, Cabell Co, WV, in 2000, and are referenced in the website. I have no direct marriage or birth information on Lucy.
Since only one source refers to both Keaton as a birthname and Sandridge as her sister (Justine)'s married name, my best guess at this time is that this is correct, but two other books refer to her as Sandridge, while IGI as Keaton.
I left it as Keaton SANDRIDGE, but put the lineage as KEATON. In my next updating, I'll change it to Sandridge KEATON to keep it consistent.