Dorothy may have died young; she doesn't appear on the 1920 or 1930 census with her siblings.
Sources
"United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MV2R-17T : accessed 17 Aug 2014), Jessie Mckinney in household of Richard Mckinney, Los Angeles Assembly District 71, Los Angeles, California, United States; citing enumeration district (ED) 129, sheet 3B, family 80, NARA microfilm publication T624, FHL microfilm 1374094.
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DNA Connections
It may be possible to confirm family relationships with Dorothy 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 some percentage of DNA with Dorothy: