I am a teacher and I cannot understand that teacher at all. Sometimes children take books beyond their own level of reading so their parents or elder siblings can read it to them. In fact this should be absolutely encouraged! I read Harry Potter/ Percy Jackson etc to my pupils and my own children for their pleasure! We should never ban any book from a child- not a book that we would find in a school anyway! Her behaviour is very bizarre and should be challenged. Wimpy Kid books are the best!