The 1870 US Census has Mary Landreth as White.
United States Census, 1870
||Mississippi, United States|
|Birth Year (Estimated)
CITING THIS RECORD
"United States Census, 1870," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:MFSZ-Y9C : accessed 15 May 2016), Mary Landreth in household of John Landreth, Mississippi, United States; citing p. 14, family 98, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,221.