We haven't had much trouble finding stuff he wants to read that is in the 4th grade range but content appropriate. I wouldn't have let him read the Wimpy Kid books but he brought them home from the school library and it was the first time his library choice wasn't censored. I didn't want to discourage him.

I think it gets much harder around a 6th grade level book to control content. We'll just keep going along doing what we're doing and ignore her bizarre comments :-)