West Virginia Marriages, 1780-1970," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FR6Q-HTL : 11 February 2018), Samuel Cosner and Mary Ann Idleman, 17 Nov 1841; citing Hardy Co., West Virginia, v 1 p 140, county clerks, West Virginia; FHL microfilm 818,697.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8D7-LFN : 4 April 2020), Mary Ann Cosner in household of Samuel Cosner, Hardy county, part of, Hardy, Virginia, United States; citing family 1169, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
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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: