"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MW8M-MMQ : accessed 26 December 2015), Mary E C Cook in household of Henry A Cook, North Carolina, United States; citing p. 22, family 157, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,638.
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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: