I have searched for Sallie for years. I give up and then go back to her months and even years later. I have seen family members listed a domestics in other census...what were they thinking? I can't remember what year Nancy died, but it was reported, but not Sallie's. What a shame that a woman goes down in history unknown, but such were the times as anyone who has worked on this stuff for even a short period of time can tell you. I have searched the records as well. George didn't have a sister named Sallie or Sarah, not that I could find. Maybe she was a member of Nancy's family, related to her father or mother. Thanks for your time and effort.