What was Scout's first "crime" at school?Chapter 1-3

Poor Scout. She was so excited about attending her first
day of school, but by the end of the evening, she was begging Atticus not to go the next
day. Her first "crime" was already knowing how to read. Miss Caroline quickly decided
that Atticus "does not know how to teach" and demanded that Scout tell him "not to teach
you anymore." Later that day, she had her hand spanked with Miss Caroline's ruler for
defending Walter Cunningham Jr., and then she rubbed Walter's nose in the dirt in
retribution. Luckily, Atticus promised that the two would continue reading just as
before, and Scout returned to school the next day.