Mary was born in 1817. She was the daughter of John Johnson and Mary Greer. She passed away in 1880.
Sources
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXKX-Q2X : 22 August 2017), Mary A Baker in household of Mariah Baker, Harrisburg, Saline, Illinois, United States; citing enumeration district ED 110, sheet 96A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0248; FHL microfilm 1,254,248.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M859-SWJ : 12 April 2016), Mary Baker in household of John Baker, Curran, Saline, Illinois, United States; citing family 39, 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 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: