Evans - Brock Bartow - Paulding county Georgia

I are searching for Nancy Evans Brock, married after her two sons, James and Thomas, show up with her in the 1880 census in Paulding cnty Ga  James Evans, B-1874, Thomas Evans, B 1879.

Evidence that she was Cherokee Indian.

She died before the 1910 census was taken.  She married John Henry Brock, Aug. 1891.

Any information will be greatly appreciated-HAVE HIT THE BRICK WALL!!!