Mary Lamb is said to have died in 1870. (see notes)
Research Notes
I was only able to find an 1820 marriage record, and an 1860 census record showing Mary Lamb living in her daughter's household. Cannot confirm her date of birth or date of death. ( Freeth-52 15:52, 22 April 2016 (EDT) )
"Alabama Marriages, 1816-1957," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FQVB-QPY : accessed 22 April 2016), Samuel Lamb and Mary Graham, 23 Mar 1820; citing reference ; FHL microfilm 1305696 V. 3-3E.
As remembered by John Isbell Graham on 5 September 1923. (statement linked above)
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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: