Mary 'Polly' Corley Stradford's date of death is unknown but it would be after 1870 as she was in the 1870 Census.
Sources
Mary Corley-Overview-AncestryLibrary.com
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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: