I'm showing the wife of Moses Williamson as a JANE MILES 1726-1797 ) rather than Jane Mills. My source is: The Williamson Family of Cumberland County, Pennsylvania Washington County, Pennsylvania and Ohio County, West Virginia by Raymond Martin Bell and Edna Marian Miller, Washington, PA (1986 and 1989). A copy is in Mercer County Historical Society Library, Mercer, PA .
Raymond Martin Belll, now deceased, was a professor at Washington & Jefferson College in Washington, PA. I do NOT descend from Moses Williamson, I descend from his brother, Samuel. I just thought I'd mention the SLIGHT difference in data and my source. I cannot say if your source is better. Best wishes