Does the CDIB list a village corporation? You might try contacting the Koyuk village council or try contacting the BIA office that issued the CDIB and ask for a copy of the documentation supporting the card.
You probably already have this, but here is Rosalea in a couple of census records:
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHBL-MTM : accessed 7 November 2019), Rosalea Atmik, Cape Nome, Second Judicial District, Alaska, United States; citing enumeration district (ED) ED 1, sheet 22B, line 46, family 659, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2627; FHL microfilm 2,342,361.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VYWN-T72 : 26 July 2019), Rose Lee Walker in household of Walter Walker, Seward Recording District - No. 27, Third Judicial Division, Alaska Territory, United States; citing enumeration district (ED) 3-1, sheet 1B, line 37, family 23, 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 4580.
