Joe,

Not saying the info contained in this site is accurate, but look at the dates the CSA states were allowed back into the Union. Not only your grandmother was a CSA citizen, but perhaps thousands of others.

Alabama July 13 1868

Arkansas June 22 1868

Florida June 25 1868

Georgia 1st Date July 21 1868; 2nd Date July 15 1870

Kentucky Elected Union & unelected rump C.S.A. governments from 1861

Louisiana July 9 1868

Mississippi February 23 1870

Missouri Unionist govt. appointed by Missouri Constitutional Convention 1861

North Carolina July 4 1868

South Carolina July 9 1868

Tennessee July 24 1866

Texas March 30 1870

Virginia January 26 1870

http://www.statemaster.com/graph/gov_con_sta_of_ame_rea_to_the_uni-confederate-states-america-readmitted-union