"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCDN-VL2 : accessed 7 January 2016), Rebecca Willhite in household of Starnes Willhite, Hamilton county, Hamilton, Tennessee, United States; citing family 1540, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"Tennessee Marriages, 1796-1950," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XDQL-KB3 : accessed 7 January 2016), Jerrymiah Chambers and Rebecca Willhite, 27 Feb 1855; citing Scott,Tennessee, reference ; FHL microfilm 926,287.
It may be possible to confirm family relationships with Rebecca 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 DNA with Rebecca: