Listed as 13 year old female "attending school" in 1870 census.
In the 1880 Georgia soundex there is a listing for a Fannie Stephens, white, female, 24, Richmond County, born in Georgia, living with a Fannie Smith. Listed as "other family" are Clara Stephens, 5, born Georgia, and Georgia Stephens, 3, born Georgia. May be this Fannie.
Listed as 17 year old female "without occupation" in 1870 census.