Cora Sherman was my paternal 2nd great-grandmother. She was born in July of 1871 and married Lewis F. Leonard, son of Charles Russell Leonard, on December 20, 1886, at Moravia, Cayuga County, New York.
In 1880, the only Cora Sherman in central New York was the 8-year old daughter of James and Amy Sherman in Ledyard, Cayuga County, New York. Cora's future husband, Lewis Leonard, was living about 12 miles eastward, in Locke at the time.
This household almost definitely is the right Cora Sherman for several reasons. First, her name and middle initial matches the name given in her 1914 obituary., "Cora E. Leonard". Furthermore, her brothers "Bert" (Adelbert) Sherman of Moravia and William Sherman of Virgil are mentioned, along with two sisters, Adelaide* (aka "Addie"), referred to as "Mrs. Henry Whitmore", and Mrs. Carrie Tilghe, of Moravia.
A look back to the 1870 census for the same place reveals the following. James and Anna with Adalaide and William, a year before Cora was born.
* "New York Marriages, 1686-1980," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F6S6-BT4 : 10 February 2018), Addie Sherman in entry for George Seacoy and Mable A. Whitmore, 05 Mar 1914; citing reference p643 n3223; FHL microfilm 853,184.