The Fish surname (and variants) always interests me in Mass., so I went looking. Their daughter Esther has a couple of interesting records.
Probate:
Esther Wheeler resided New Salem, and was declared insane "by means of old age helpless and almost senseless" in December 1866. She owned property in Enfield of one acre and a dwelling house adjacent to land of Ebenezer Felton. She was assigned a guardian Charles Felton of Shutesbury, and her property sold at auction 30 Apr 1867. These records also note a husband Nathan Wheeler.<ref>Franklin County Probate File #5191, Esther Wheeler.</ref>
There may be more in there if anyone wants to dig, records probably available on FamilySearch.
Her death record:
Ester Wheeler, married, died 18 July 1867, age 80 of old age in Shutesbury, born Shutesbury to Ezra Fisher born Oxford and Ester Fenerer [?] born Billingham<ref>Massachusetts: Vital Records, 1841-1910. (From original records held by the Massachusetts Archives. Online database: AmericanAncestors.org, New England Historic Genealogical Society, 2004.) [https://www.americanancestors.org/DB191/i/10235/257/121351808 1867 Shutesbury deaths, entry #10, death of Ester Wheeler.] (Link by $ubscription)</ref>
I haven't added these to her profile as it throws doubt on the parental relationship with Seth.