Hi Matthew. For the life of me, I can't find my notes telling me why I believe that Sarah Ann Vance who married Elihu Dewitt was originally Sarah Ann Feighner. I have a note to myself that John and Solomon Feighner are found on p. 302 of Union Twp, Huntington Co, IN 1860 census and Sarah with a ?. Sarah's birthplace was listed as Ohio on the 1880 and 1900 census.
If Sarah Ann Vance was a Feighner, it does sound like she could be a twig on your genealogical tree. Let me know if you come up with anything else which would link my Sarah to your family and I'll try to locate my notes. Nancy