The 1910 Census[1] shows her at age 8 in the home of her widowed mother in Union Township, Laclede County, Missouri.
The 1920 Census[2] shows her at age 17 in the home of her widowed mother in Kansas City Ward 13, Jackson County, Missouri.
Sources
↑ "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2YY-PP5 : accessed 2 October 2021), Mary Barnes in household of Margaret E Barnes, Union, Laclede, Missouri, United States; citing enumeration district (ED) ED 48, sheet 7A, family 146, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 794; FHL microfilm 1,374,807.
↑ "United States Census, 1920", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M8HG-FF9 : 2 February 2021), Mary Barnes in entry for Margaret E Barnes, 1920. Missouri > Jackson > Kansas City Ward 13 > ED 210 > image 10 of 32; citing NARA microfilm publication T625 (Washington, D.C.: National Archives and Records Administration, n.d.).
Profile Barnes-2091 created through the import of ChambersBarneshistory.ged on Oct 19, 2011 by Charlene Chambers.
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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: