Dorothy was born in 1920. She was the daughter of Earl Arneson. She passed away in 2011.
Sources
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KSK2-XZN : 7 January 2021), Dorothy M Arneson in household of Earl Arneson, South Saint Paul, Dakota, Minnesota, United States; citing enumeration district (ED) 19-38, sheet 10B, line 76, family 201, 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 1918.