Thank you for your request. I have looked, but did not find a Sarah Keller married to John W. Spencer, however, I am going to forward your request to some of the other members of our Association.
We are going to have a Web Site soon, if not now, so you might want to check that from time to time.
I do believe some of the Kellers went to Perry County, Ohio.
My Dad wrote the Keller Family History. If you are close to
a LDS library or can or a State Library and Archive, his book could be there. His book was placed in all States in U.S.
Sorry I could not be of more help.
Jane K. Ingram