Shepherd, Mary Robertson Shepherd, b Feb 14 1771 d Dec 25 1839
“In memory of Mary Robertson Shepherd, consort of Stephen Shepherd who died in Kentucky Oct 1 1825 in the 58th year of his age.”***********

It looks like this should be the one to whom you refer as her husband died in Ky and she continued to MO. Possibly you are right that the year was incorrectly read, but I have no way of knowing, as I just copied the cemetery from "a copy" that had been given to me. I am not a Shepherd descendent. I will make a hard copy of this and see if I can find out anything else for you. Possibly some other researcher reading your message will have the soution for you, as well. Marilyn