She married Phillip Leavens Bard and had at least one child Greg Bard.
Sources
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:VBSM-NH1 : 4 January 2021), Mary Nell McKenney in household of Earl McKenney, De Kalb, Kemper, Mississippi, United States; citing enumeration district (ED) 35-15, sheet 8A, line 17, family 157, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 2037.
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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: