Hmm.
I have a second-grader, too, and I think I would be hesitant to have her read Anne Frank yet.
The biggest problem for me is that it is true, not make-believe.
In DD's case, I do read her fiction that is aimed at older kids. But she doesn't read it to herself. That way we can talk over the more sensitive issues as we go.
That might be a compromise here. If she is that gung-ho about the book, maybe you can read it TO her. Then you can censor a sentence here and there, if need be, and discuss the concepts as you go.
Also, you might talk to the librarian. At DD's school, certain fiction is set aside for older kids. Younger kids can check it out, but need a note from home first -- a good middle ground, in my opinion.
