"Canada Census, 1871," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4QY-J4G : 2 April 2016), Mary Snyder in household of Samuel Snyder, North Dumfries, South Waterloo, Ontario, Canada; citing p. 47, line 2; Library and Archives Canada film number C-9943, Public Archives, Ottawa, Ontario; FHL microfilm 4,396,614.
"Ontario Deaths, 1869-1937 and Overseas Deaths, 1939-1947," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:JFQN-CMH : 11 December 2014), Mary Snyder, 04 Jul 1874; citing North Dumfries, Waterloo, Ontario, yr 1874 cn 10978, Archives of Ontario, Toronto; FHL microfilm 1,846,472.
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 DNA with Mary: