FAG implies maiden is Greene not Dewey. If you see the actual Vermont death record, the last name of Dewey is scratched out after her father’s Nathan name. Dewey is her married name.
Sources
"Vermont, Vital Records, 1760-1954," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XFSQ-8L2 : accessed 19 February 2015), Susan S. Dewey, 03 Sep 1881, Death; State Capitol Building, Montpelier; FHL microfilm 540,083. [1]
Find A Grave memorial page for Susan Greene Dewey (4 May 1808–3 Sep 1881), Find A Grave: Memorial #148838228, citing Greenwood Cemetery, Saint Albans, Franklin County, Vermont, USA
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DNA Connections
It may be possible to confirm family relationships with Susan 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 Susan: