The detailed Find-a-grave entry for Mollie indicates that her burial location is unknown; however, it includes death information, so I'm including it here.
Sources
Burial
Find A Grave, database and images (http://findagrave.com : accessed 10 June 2017), memorial #161293825 for Mollie Laura Cline Jackson (1891 - 1918) - Find A Grave Memorial.
Marriage
"West Virginia Marriages, 1780-1970," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FTLM-S36 : 4 December 2014), George Jackson and Mollie Cline, 1916; citing Wyoming, West Virginia, United States, , county clerks, West Virginia; FHL microfilm 598,120.
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DNA Connections
It may be possible to confirm family relationships with Mollie by comparing test results with other carriers of her 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 Mollie: