Sarah "Sally" Garrett, c1850 SC, md GA

Seeking info on the family of Sarah "Sally" Garrett or Jarrett.She was born c1850 in SC, married c1866 in Pickens, Cherokee or Whitfield Co GA to Joe (Joseph, Josiah) Duckett.They had 4 children, she died between birth of last child 1875 and his 2nd marriage 1879.
Have been told she might be the daughter of John and Samantha Garrett Garrett (cousins), but cannot find them in GA.Can't find Joe in SC to have met Sally.
Please email with any hints or help.