"Davis - The Settlers of Salem, West Virginia," p. 16, identifies her as Mary VanHorn. But other sources, including daughter Elizabeth's obituary, identifies her as Elizabeth D. VanHorn.
[S83] Davis - The Settlers of Salem, West Virginia, Susie Davis Nicholson, (Gordon Printing Co, Strasburg OH, 1979 (Revised & Enlarged) < www.wvgenweb.org/harrison/books.htm >), p. 16.