Not sure if this Eunice, wife of Asa is the same woman, birth year doesn't seem to match.
Source: "New Hampshire Death Records, 1654-1947," database with images, FamilySearch (
https://familysearch.org/ark:/61903/1:1:FSL3-44F : 23 February 2021), Eunice Porter, 18 Dec 1821; citing Marlborough, Bureau Vital Records and Health Statistics, Concord; FHL microfilm 1,001,101. IMAGE:
https://www.familysearch.org/ark:/61903/3:1:S3HT-DZH7-Q4Q?personaUrl=%2Fark%3A%2F61903%2F1%3A1%3AFSL3-44F
New Hampshire Death Records
: Eunice Porter
: Death 18 Dec 1821 Marlborough , NH
: Age 61 Birth 1760
Source: "Find A Grave Index," database, FamilySearch (
https://www.familysearch.org/ark:/61903/1:1:QVV2-R7M8 : 6 March 2021), Eunice Porter, ; Burial, Marlborough, Cheshire, New Hampshire, United States of America, Meeting House Cemetery; citing record ID 22339995, Find a Grave,
http://www.findagrave.com.
Burial: Meeting House Cemetery, Marlborough, Cheshire County, New Hampshire
: Mrs Eunice Porter wife of Mr Asa Porter Died Dec. 18, 1821 age ''61?''
https://www.findagrave.com/memorial/22339995/eunice-porter