Both census records say she was born in 1830 even though these records are attached to Sarah Russell born 9/4/1825.
Sources
↑ "United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF3N-4Y1 : 19 February 2021), Sarah Lendy, Fort Fairfield, Aroostook, Maine, United States; citing enumeration district ED 205, sheet 196A, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,476..
↑ "Maine, J. Gary Nichols Cemetery Collection, ca. 1780-1999," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKXM-72KF : 16 March 2018), Sarah Lundy, ; citing Caribou, Aroostook, Maine, United States, Cemetery Irish, Maine State Library, Augusta; FHL microfilm 2,171,139.
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DNA Connections
It may be possible to confirm family relationships with Sarah by comparing test results with other carriers of her 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 Sarah: