I have found the parents of Nancy E. Conn of Poinsett County, Arkansas. She is listed on the 1870 census of the County with her parents, Robert W. and Carey, from Kentucky and Alabama, respectively. She is 12 years old which lines up with her date of birth (1858). I think Robert W. was Levi Conn's brother and that Caroline Duke was Elizabeth Duke's sister. Nancy E. married John Matthew Harris and was the mother of Francis, Sally A., Laura Etta, Lura Dove, and Grover Harris.