Mary died between between 1870 and 1880 in Ashe County, North Carolina.
Sources
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4BQ-LNP : 5 April 2020), Mary Duvaul in household of John Duvaul, Ashe county, Ashe, North Carolina, United States; citing family 583, NARA microfilm publication...
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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 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:
Plummer-3381 and Plummer-1220 appear to represent the same person because: Birth dates are different but one is a clear estimate that is off the mark -- i.e. birth 1813 - marriage 1818 (or thereabouts. Child bridSandie. They both married John Duvall. They both are associated with Ashe, North Carolina.
Thanks for considering. Sandi