Note: Ancestry.com (and FindAGrave) say that she died on August 19, 1880 and is buried in Archer Cemetery in Hamden, but I can't find any proof of that. I know that she died after 6/10/1880 because that was the date of the last census that I've found her listed.
Find a Grave, database and images (https://www.findagrave.com : accessed 03 November 2020), memorial page for Mary Ann Chase Covert (1819–19 Aug 1880), Find A Grave: Memorial #194518623, citing Woodland Cemetery, Delhi, Delaware County, New York, USA ; Maintained by Joseph S (contributor 47965407) .
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