Aunt Alexandra is a conservative woman who bases her life on her own personal traditions. She is concerned with distinctions among people:
Atticus's sister, Alexandra Finch Hancock, is a conservative woman concerned with social and class distinctions and bound to the traditions of the South.
She and Calpurnia, the black housekeeper, have a professional relationship. She treats Calpurinia with respect, but she does not believe Scout and Jem should go to church with her. She believes the children have their own church which happens to be a white church. She shares her sentiments with Atticus, hoping he will keep the children separated from Calpurnia's personal life.
Aunt Alexandra does not feel that Scout and Jem should visit Calpurnia's home. Aunt Alexandra believes blacks and whites should be separated in certain instances. While she is not overtly prejudiced, she does have some hidden prejudices. Keeping the children separate from Calpurnia's way of life is a hidden prejudice. No doubt, Aunt Alexandra would never admit to being prejudiced, but she most likely has her own prejudices that she keeps to herself.
As a positive characteristic, Aunt Alexandra was upset, as was Calpurnia, when Tom Robinson was shot and killed.