Miss Caroline is from Winston County, an area of North Alabama that is notorious in Maycomb.
Miss Caroline is the new first grade teacher. She is brand new as a teacher. When she introduces herself to the class, they are shocked.
I am from North Alabama, from Winston County." The class murmured apprehensively, should she prove to harbor her share of the peculiarities indigenous to that region… (ch 2)
Part of the problem is that Winston County is notorious for having seceded from the state of Alabama in the civil war, when Alabama seceded from the Union. There are other reasons that people in Maycomb do not trust North Alabama.
North Alabama was full of Liquor Interests, Big Mules, steel companies, Republicans, professors, and other persons of no background. (ch 2)
Miss Caroline being “peculiar” and from another region allows the reader to get information about Maycomb from an outsider’s perspective. As Scout teaches Miss Caroline about Maycomb, the reader learns too.