Why does Aunt Alexandra worry about Scout?

Aunt Alexandra holds the opinion that Atticus gives his children the freedom to do what they wish. She worries that Scout isn't brought up as a polite southern girl. Scout wears overalls and is pretty much a tomboy. She is not submisive and, much like her father, stands up when she feels an injustice has taken place. In Chapter 9 Scout further adds to Aunt Alexandra's worries by belting Francis (Aunt's grandson)for calling Atticus a "nigger lover".