She married Levi Bradley (his second wife), 17 Jan 1819.
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Sources
"Vermont Vital Records, 1760-1954," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:V8MB-X5P : 6 November 2017), Levi Bradley and Polly Sherbern, 17 Jan 1819, Marriage; State Capitol Building, Montpelier; FHL microfilm 27,684.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MC2H-SPV : 12 April 2016), Mary Bradley in household of Levi Bradley, Danville, Caledonia, Vermont, United States; citing family 129, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).