Can you suggest good books for my six year old advanced reader?

My daughter is between kindergarten and first grade, but she is reading well beyond her grade level. I'm running into a problem finding chapter books for her to read. While she's capable of reading books like Judy Moody, she doesn't like them because she can't relate to a third grader. (I actually had to explain to her what a spelling test was). She can relate better to characters like Junie B. Jones, but those books are too easy for her. Any suggestions of books that will engage a six year old and challenge her at the same time?