There are numerous Elijahs/Elishas, Marys, Williams and Herds in this particular branch of the family. I think the family group you are referring to may be:
Mary WALLING Daughter of William WALLING and Hannah (RICE?) m. to Elijah HERD source: Williams, pp. 5,13.
Mary's father was..
William WALLING Son of Thomas WALLING and Mary COX b. ca. 1761 m. to Hannah (RICE?) d. after 1830 Children of Williams WALLING and Hannah (RICE?): Mary WALLING (m. to Elijah HERD) Milla WALLING (m. to Jesse HERD) source: Williams, pp. 3,5
Williams' father was..
Thomas WALLING (brother of Elisha the LH) Son of Elisha WALLING and Mary (BLEVINS?) b. ca. 1731, MD m. ca. 1756, to Mary COX d. ca. 1801, Lee Co., VA Children of Thomas WALLING and Mary COX: Stephen WALLING (m. to Mary MORRELL) Elisha WALLING (m. to Anne ________) William WALLING (m. to Hannah (RICE?) Matthew WALLING (m. to Amy RICE) Judith "Judy" WALLING (m. to Isaac CHRISMAN) (daughter) WALLING Joseph WALLING (m. to Fanny ______) source: Williams, p. 3