The reference below mentions Sallie in her father's write-up. David Johnston with his family came from the county of Culpeper, Virginia, in 1778, and settled in the New River valley on the plateau between Big Stony Creek and Little Stony Creek, about one mile from the river, at the place now known as the John Phlegar farm in the county of Giles. Johnston`s family consisted of himself and wife, two sons, the third son being then absent in the American army, and five daughters, the eldest of the daughters, whose name was Sallie, and who had intermarried with Thomas Marshall, together with her husband, came with the family.
Find a Grave, database and images (https://www.findagrave.com : accessed 05 May 2020), memorial page for Sallie Johnston Marshall (1752–1790), Find A Grave: Memorial #188191172, citing Johnston Cemetery, Giles County, Virginia, USA ; Maintained by Darlene Bromwell Marshall (contributor 49265168) .
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DNA Connections
It may be possible to confirm family relationships with Sarah by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Sarah: