The following is probably Betsy as a witness to her father's deed. If so, she had to be at least age 14 to witness, or born by 1778.
Pennsylvania Co VA DB 9
Betsy Walters married John Slayden. Charles Collie was the Bondsman, Robert Walters, her father, signed permission, indicating she was underage.
Elizabeth "Betsy" WALTERS and John William SLAYDEN were married on 16 December 1799 in Pittsylvania County, Virginia.1,33 John William SLAYDEN, son of Daniel SLAYDEN and Anne WALLER, was born (date unknown).
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