Marge -- I looked and couldn't find any members of this family in 1870 nor 1880 to make positive connections, however, I did find Nancy (?) Doster on the following censuses:
1900 Carroll Co., MS Nancy Doster76 SC SC SC widow living with Elizabeth A. Davis 50 SC SC SC family labeled "mother-in-law."
1910 Carroll Co., MS Nancy Doster88 SC SC SC widow living with George W. Doster 58 AL SC SC family labeled "mother."
Elizabeth A. Davis in 1900 corresponds in age and birthplaces to Eliza on the 1860 Marion Co., AL census and George W. Doster in 1910 corresponds in age and birthplaces to George on the 1860 Marion Co., AL census.More detailed research is required to make any sense of these data.Curiously Eliza, Louisa, and Nancy, purported wives of John Doster, all have the same approx. birthdates and places.Regards, Jim N.