The manager of the ref family tree, Karen Kirk and I are DNA matched at 5th to 8th cousins. Therefore I place higher confidence in the information in her family tree. In addition she shows Mary as a direct ancestor also.
Sources
Ancestry.com Kirk-Littlefield family tree
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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 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: