I believe your sally is this Sara Sally Wall
Virginia, Marriages, 1785-1940
Name: Aaron Silver
Spouse's Name: Sally Wall
Event Date: 08 Nov 1788
Event Place: Botetourt, Virginia
Spouse's Father's Name: Conrod Wall
Indexing Project (Batch) Number: M86871-7 , System Origin: Virginia-EASy , GS Film number: 30734 , Reference ID: pg 43
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"Virginia, Marriages, 1785-1940," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XRC3-B72
: accessed 02 Oct 2014), Conrod Wall in entry for Aaron Silver and Sally Wall, 08 Nov 1788; citing Botetourt, Virginia, reference pg 43; FHL microfilm 30734.
Abigail wall Hill wrote in her will on March 20 1787 and it was was probated April 3 1787 which was recorded in the deed book (not the will book) of Montgomery Co. VA. Book A P.415. She mentions her brother Conrad his daughter Sally, sons John, Adam and Conrad Jr. She also mentions Adam son of John Wall whom she "stood Godmother for" She also gave to James Salles (Sallus) a cow. Pg 278 "Early Adventures on the Western Waters"