"Virginia Births and Christenings, 1584-1917," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XT4B-9ZT : 9 March 2018), Elizabeth Gray in entry for Sarah Isbel Gray, 18 Sep 1860; citing Page, Virginia, reference p 55; FHL microfilm 2,046,963.
Possible 1870 census for Sarah: "United States Census, 1870", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFG1-T7C : 12 June 2019), Sarah I Gray in entry for John Miller, 1870.
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DNA Connections
It may be possible to confirm family relationships with Mary by comparing test results with other carriers of her ancestors' 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 Mary: