I loved the Mrs. Piggle Wiggle series when I was her age. It's 3rd grade level and has not so subtle sub text about the importance of bathing, eating your veggies and so forth.

http://www.amazon.com/Mrs-Piggle-Wiggle-Betty-MacDonald/dp/0064401480

Here's another wonderful series my DD loved :http://www.amazon.com/Dealing-Dragons-Enchanted-Forest-Chronicles/dp/015204566X

It's very girl positive although it is 4th grade level.