After searching Ancestry.com, the internet through Google.com, etc., I could not locate a record for her. A record on Familysearch.org for a woman born the same year and with the same name was found: "Ontario Marriages, 1869-1927," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FMNY-CJW : 11 March 2018), Eleanor Casselman in entry for Michael L Nudell and Ellen Jane Casselman, 21 Dec 1880; citing registration , Williamsburgh, Dundas, Ontario, Canada, Archives of Ontario, Toronto; FHL microfilm 1,869,512. This person could also be Ellen Morgan who married John M Casselman (1800-1866).
She may be confused with sibling Cornelia Eleanor "Nellie" Casselman (1801-1835).
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DNA Connections
It may be possible to confirm family relationships with Eleanor 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 Eleanor: