FindAGrave lists Mary Lou as a Riffle; however a death index record shows the same birth and death dates with her parents listed as Amos, which is backed up by census records. It is possible her married name was Riffle as she is listed as widowed in the death index record. More research is needed.
Sources
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MST2-PK8 : accessed 15 December 2018), Mary L Faw in household of Amos Faw, Obids & Peak Creek townships, Ashe, North Carolina, United States; citing enumeration district (ED) 15, sheet 21B, family 403, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,182.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLSG-BR1 : accessed 15 December 2018), Lou Faw in household of Amos Faw, Obids, Ashe, North Carolina, United States; citing enumeration district (ED) ED 29, sheet 7A, family 111, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1096; FHL microfilm 1,375,109.
"North Carolina Deaths, 1931-1994," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FGYW-57Q : 10 February 2018), Mary Lou Faw, 21 Jul 1961; citing Jefferson, Ashe, North Carolina, Vol 18A, cn 18497, State Department of Archives and History, Raleigh; FHL microfilm 1,953,242.
"Find A Grave, Inc.", FindAGrave.comMary Lou Riffle Faw (1890-1961) accessed 13 December 2018; Memorial No. 90273857, Records of Holy Trinity Episcopal Church Cemetery, Glendale Springs, Ashe County, North Carolina.
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DNA Connections
It may be possible to confirm family relationships with Mary 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 Mary: