On her obituary she is named as Dorothy M Hatstat Tessier Frigoletto
1920 US Census - "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF9L-23F : accessed 25 April 2020), Dorothy M Hatstat in household of Manley G Hatstat, Leominster Ward 3, Worcester, Massachusetts, United States; citing ED 103, sheet 9B, line 83, family 214, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 747; FHL microfilm 1,820,747.
GenealogyBank Obituaries - "United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKWK-TS81 : accessed 25 April 2020), Mrs Dorothy M Hatstat Tessier Frigoletto, Fitchburg, Massachusetts, United States, 02 Dec 2008; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Sentinel & Enterprise, born-digital text.
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It may be possible to confirm family relationships with Dorothy 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 Dorothy: