Quote 1
Alexandra's voice cut through her ruminations: "Jean Louise, did you come down on the train Like That?" (2.45)
For anyone who has read To Kill a Mockingbird, Aunt Alexandra's character is no surprise. She is the voice of the old Southern matriarchy, making sure her niece always puts on a good face, regardless of how Jean Louise actually feels.
Quote 2
"I do wish you'd try to dress better while you're home. Folks in town get the wrong impression of you. They think you are—ah—slumming." (2.48)
Aunt Alexandra is very concerned with what other people think of Jean Louise, as a reflection on her. In a small Southern town, women with nothing better to do care very much about the society's opinion of them.
Quote 3
"But you're just saying that a Clinton's not good enough for a Finch." (3.62)
Ugh, Aunt Alexandra. She believes in high breeding and not associating with anyone she deems a "lesser" kind, for fear they may contaminate the bloodstream.