According to her obituary[4], she died on 31 March 1949 at Massachusetts General Hospital.
Sources
↑1880 Census:
"1880 United States Federal Census"
Year: 1880; Census Place: Newton, Middlesex, Massachusetts; Roll: 546; Page: 165B; Enumeration District: 479 Ancestry Sharing Link - Ancestry Record 6742 #21357727 (accessed 27 December 2021)
Lizzie T Sumner (4), single daughter in household of John S. Sumner (40) in Newton, Middlesex, Massachusetts, USA. Born in Massachusetts.
↑ "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9TD-KHT : accessed 30 September 2021), Elizabeth T Sumner in household of John L Sumner, Newton city Ward 7, Middlesex, Massachusetts, United States; citing enumeration district (ED) 911, sheet 7B, family 132, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,664.
↑ "Massachusetts Marriages, 1841-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N44M-1JJ : 10 March 2021), Harry Adams Harwood and Elizabeth Tolman Sumner, 11 Oct 1905; citing Newton City, Middlesex, Massachusetts, United States, State Archives, Boston; FHL microfilm 2,057,622.
↑ Boston Herald Sunday, Apr 03, 1949 Boston, MA page 135
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DNA Connections
It may be possible to confirm family relationships with Elizabeth 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 Elizabeth: