DD is also outgrowing Henry and Mudge and Mr. Putter and all their friends (*sniff* I will miss them!) She recently started a series called "Heidi Heckelbeck." It seems pretty good, although she's definitely not completely innocent. I like it more than Junie B. Jones, anyway. (I've not read any of the Fairy books, so I can't comment.)

I seem to recall the Horrible Harry books being pretty decent, although it's been a couple of years since I looked at one.