Book recommendations wanted

[dampscribbler]

 Darling Daughter keeps bringing home school library books way above her reading level and having to return them within 4 days.  This week she brought home one of the Warriors series which we haven't even had a chance to crack open.  An anyone recommend similar books that are more at a first grade reading level?  She's already read the Catwings series by Ursula LeGuin (a couple times, she loves them).  

Thanks!!