Her middle name may be Belding. Some researchers think that she is named after her grandmother Sarah Vantine which would give the missing maiden name.
Sources
"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MCYG-6SX : 23 December 2020), Sarah Hart in household of Benjamin Hart, Brooklyn, Kings, New York, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
"New York State Census, 1855," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K671-SYX : 3 March 2021), Sarah Hart in household of Benj Hart, E.D. 2, Ward 5, Brooklyn City, Kings, New York, United States; citing p. , line #21, family #150, county clerk offices, New York; FHL microfilm 1,930,197.
"New York State Census, 1865," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVNJ-5PLZ : 8 March 2021), Sarah Howard in household of Benjiman Howard, District 02, Ward 05, Brooklyn, Kings, New York, United States; citing Census, p. 37, citing multiple county Clerks; Warren and Lewis County Board of Supervisors; multiple counties in New York; Utica and East Hampton Public Libraries, New York.
"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MZ8K-832 : 14 January 2022), Sarrah B. Hart, Brooklyn, Kings, New York, United States; citing enumeration district , sheet , NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm.
"New York, New York City Marriage Records, 1829-1940", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:Q2CN-9F9H : 16 June 2022), Sarah B Revere in entry for George Washington Hart and Susie Adel Simons, 1885.
"New York, New York City Municipal Deaths, 1795-1949," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:2WFR-NJW : 2 June 2020), Sarah Belden Revere in entry for Rachel Vantine Hart Vreeland, 5 May 1908; citing Death, Brooklyn, Kings, New York, United States, New York Municipal Archives, New York; FHL microfilm 1,324,167.
"Washington Death Certificates, 1907-1960," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N3PF-42J : 10 March 2018), Sarah Revere in entry for Anna Trexler, 03 Apr 1927; citing Vancouver, Clark, Washington, reference cn 53, Bureau of Vital Statistics, Olympia; FHL microfilm 2,022,419.
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