Mary was born about 1819. She passed away about 1880.
Sources
"Alabama Marriages, 1816-1957," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FQ8G-25F : 9 February 2018), James W. Armstrong and Mary Ann Claghorn, 19 Oct 1837; citing reference ; FHL microfilm 1,492,030.
"Alabama County Marriages, 1809-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKZ3-89C3 : 6 November 2017), James W. Armstrong and Mary Ann Claghorn, 19 Oct 1837; citing Montgomery, Alabama, United States, County Probate Courts, Alabama; FHL microfilm 1,492,030.
"Alabama County Marriages, 1809-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKMB-GQT4 : 16 July 2015), James M Armstrong and Mary Ann Claghorn, 17 Oct 1837; citing Montgomery, Alabama, United States, County Probate Courts, Alabama; FHL microfilm 2,358,442.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4JD-3JW : 22 August 2017), Mary A Armstrong in household of J W Armstrong, Mount Ida, Crenshaw, Alabama, United States; citing enumeration district ED 59, sheet 455C, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,010.
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DNA Connections
It may be possible to confirm family relationships with Mary 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 Mary: