Ideas on books for advanced reading 6 year old

[TheEnthusiasticTroll]

Have read almost all Roal Dahl, far away tree and magic chair, mr gump, horrid henry, she doesn't like rainbow fairies.

Does like battersea dogs series but a little too basic, she likes the idea of Jacqueline Wilson but story line is a little beyond her grasp in suitcase kid and another she has that I don't remember the name.

Looking to replenish for Xmas plus she has come off reading scheme at her request as she told her teacher that the easy reading books where taking up too much time when she could be reading what she wants. and I have agreed to use own books until school are able to purchase some free choice books for her.

Any ideas based on these likes, her reading has really taken off and struggling to keep up with her. Would like a series suitable for her ability that isn't a over her comprehension.

[jamdonut]

The Moomins? I loved that series of books!