"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K73Q-Q61 : accessed 14 January 2018), Earlena M Ennis in household of James E Ennis, Tract 94, District of Columbia, Police Precinct 12, District of Columbia, District of Columbia, United States; citing enumeration district (ED) 1-479, sheet 61A, line 31, family 66, 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 569.
It may be possible to confirm family relationships with Earlena 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 DNA with Earlena: