US Census 1870 states Mary was born in Canada; while Minnesota State Census 1875 states she and her parents were born in Indiana.
Sources
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDHF-N45 : 17 October 2014), Mary Cain in household of Silas Cain, Minnesota, United States; citing p. 10, family 76, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 830,433.
"Minnesota State Census, 1875," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKNJ-LZ2 : 15 November 2014), Mrs. Cain in household of Silas Cain, La Crescent, Houston, Minnesota; citing p. 285, line 2, volume Houston County, State Library and Records Service, St.Paul; FHL microfilm 0565723.
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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: