Rhoda was born about 1806. She married Pleasant Mangrum in 1822 in Tennessee and they had two sons and two daughters. She lived in Wiliamson Co., TN her entire life spending her years after her husband's death living with her children. She passed away about 1880.
United States Census, 1850, database with images, FamilySearch: 9 April 2016), Tennessee > Williamson > Williamson county > image 336 of 356; citing NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.). 
United States Census, Year: 1860; Census Place: District 1, Williamson, Tennessee; Roll: M653_1279; Page: 109; Family History Library Film: 805279 
United States Census, Year: 1870; Census Place: District 1, Williamson, Tennessee; Roll: M593_1571; Page: 1A; Family History Library Film: 553070 
United States Census, Year: 1880; Census Place: District 1, Williamson, Tennessee; Roll: 1285; Family History Film: 1255285; Page: 6C; Enumeration District: 228 
It may be possible to confirm family relationships with Rhoda 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 DNA with Rhoda: