Hmm my dd could read one in an hour at 6 so I'm sure the op's dd is reading them particularly considering how addicted they can get with them.My dd 7 is now on number 50!!!!
Sorry I don't get the snobbery they're just cute formulaic twee books .They kick started my dd into devouring paperbacks.Dd will read 1 a night then a few chapters of something heavier.She has an amazing imagination and devours all types of books.Soooooo some that my dd has enjoyed in no particular order:-
Ivy and Bean(the entire lot,bloody fantastic and funny)
The Trouble With daisy series
Judy Blume The Pain and The Great One series
Enid Blyton Amelia Jane
Bella Donna series
The Worst Witch series
Chris Riddel's Ottoline books
Lauren Child's Pippi Longstocking
Anna Hibiscus series
Mrs Pepperpot
the easier Jacqueline Wilson books
Tumtum and Nutmeg series
Felicity Wishes series
Flat Stanley series
Horrid Henry
Spiderwick Chronicals
easier Roald Dahl
easier Rummer godden
Sophie series
Wimpy Kid series
Judy Moody series
Humphrey series
Madam Pamplemousse books
the big fat Usborne collected stories books
Lots more I can't remember, don't forget the more heavy weight picture books like Katie Morag,Percy the Park Keeper etc.
For more lightweight stuff(which I think they need just as much to keep them addicted to reading)dd has loved:-
The Fairy House series
Lily's Dressing Up Dreams series
The Secret Mermaid series
Magic Pony series
The Pony Mad Princess series
We're just getting into the meatier paperbacks now,masses of Enid Blyton I think starting off with The Wishing Chair books,The Faraway Tree books,Secret Seven,Famous Five etc,rest of the Roald Dahl books etc,etc
My dd reads a good 2 hours a day to herself now so don't worry re Rainbow Fairies-it's reading and a reading child is a good thing.