Why would you want to wean a 9 year old off of Enid Blyton books?
I presume you mean the Famous Five, Secret Seven, Mallory Towers books from EB and not the Noddy series aimed at younger children.
EB books are aimed at your GD age group. Some of the contents may be deemed a little old fashioned in today's society and dismissed by several minority groups as being un-PC ! However, on the whole EB writes using an eclectic mix of vocabulary and generally gives the message that children should show respect and manners to others.
Would so many 'adventures' happen to the same bunch of children in real life? No, but in real life would divorce, murder, disasters and the many other scenarios that seem to happen weekly in trashy TV Soap-land really happen to one small community? Definitely not, yet the soaps are avidly watched by many.
Be thankful that your GD has a hunger to read books, an activity sadly lacking in so many of the youth today with their distraction of computer games.
I read an EB everyday from the time I could read until I was in my early teens at boarding school. It opened up the world of the written word, my school reports always stating how my reading level was far in advance of my peer group.
I remain an avid reader, I'm a published writer and I would still read and enjoy an EB book if there was one in front of me.
Your GD will know when she is ready to try other authors but at the tender age of 9 please allow her to enjoy reading the books that she wants to read without criticism.