I will have to look out for some of the stories by George McDonald.
In fact, I'll cut and paste a lot of this thread due to having a voracious young reader in the house and always being on the look out for new reading suggestions.
We've just discovered Eva Ibbotson via Journey to the River Sea and I have tucked away a couple more by her for Christmas. She tried the Owl Service by Alan Garner, but found the blend with mythology a bit hard to grasp just yet (I enjoyed re-reading it though
)
She has also really enjoyed the Tiffany books, although I haven't handed over the last one just yet. Which probably just means that she has read it while I wasn't looking