Dorothy was born in 1934. She was the daughter of Perley Betts and Ethel Durrell. She passed away in 2005.
Sources
1940 "United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KMMX-L21 : 5 January 2021), Dorothy A Betts in household of Perley F Betts, Gardiner, Gardiner, Kennebec, Massachusetts, United States; citing enumeration district (ED) 6-34, sheet 12A, line 28, family 271, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1480.
Marriage "Maine, Marriage Index, 1892-1966, 1977-1996," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KCJM-Q5W : 27 November 2014), Alvah E Donnell and Dorothy A Betts, 21 Nov 1952; citing Marriage, Maine, United States, State Archives, Augusta.