Mamie was buried 26 Dec 1962 at Sherman, TX, West Hill Cemetery.
Sources
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KWVY-122 : accessed 13 Nov 2013), Mamie L Robinson in household of Brice A Robinson, South 5th Ward, Sherman, Justice Precinct 1, Grayson, Texas, United States; citing enumeration district (ED) 91-11, sheet 16A, family 399, NARA digital publication of T627, roll 4043.
"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/HY6Q-CMM : accessed 13 Nov 2013), Mamie L Robinson in household of Brice A Robinson, Sherman, Grayson, Texas, United States; citing enumeration district (ED) 0007, sheet , family 143, NARA microfilm publication .
"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M3F9-QJJ : accessed 30 January 2015), Robert * Lawrence, Mammoth Spring Township Mammoth Spring town, Fulton, Arkansas, United States; citing sheet 7A, family 144, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,059.
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DNA Connections
It may be possible to confirm family relationships with Mamie 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 Mamie: