The Warriors books by Erin Hunter, maybe? I'll have to ask Abby how scary those are.
There's also Heather Brewer's The Chronicles of Vladimir Tod series about a half-vampire boy struggling through middle school and early high school. The first book was called Eighth Grade Bites.
Oh, and here's one she might really have fun with-- Oh. My. Gods. by Tera Lynn Childs, who's one of my writing buddies.
Here's the back cover blurb:
A modern girl's comedic odyssey in a school filled with the descendants of Greek gods.
When Phoebe's mom returns from Greece with a new husband and moves them to an island in the Aegean, Phoebe's plans for her senior year and track season are ancient history. Now she must attend the uberexclusive academy, where admission depends on pedigree, namely, ancestry from Zeus, Hera, and other Greek gods. That's right, they're real, not myth, and their teen descendants are like the classical heroes-supersmart and superbeautiful with a few superpowers. And now they're on her track team! Armed only with her Nikes and the will to win, Phoebe races to find her place among the gods.
It's recommended as being for twelve and up.
How about Diana Wynne Jones? Anything, but especially
Witch Week, Charmed Life, The Magicians of Caprona
or
Dogsbody.
However, in some ways she still has an 11-year-old mind. She likes fantasy, but not if it's "too scary." She thinks Harry Potter is too scary. I suggested Robin McKinley. Any other ideas?
Douglas Adams! Okay, it's not really fantasy, but I loved HHGttG at that age (I think I was 7 or 8 when I first read it). I'd advise against my go-to between grades 3 and 6, which was Piers Anthony.
Ooo! Discworld. She's a good age for Discworld.
Such good ideas. I love Gerald Durrell and Douglas Adams, but they didn't occur to me.
Is Watership Down as scary as Harry Potter?
I remember crying. & the cat was very scary, but I didn't read Harry until I was older so it's hard to compare.
Is Watership Down as scary as Harry Potter?
Given that the book ends with
the most adorable and lovable bunny of them all going CATATONIC,
I say yes.
Remember, Richard Adams wrote Watership, in case you were gettin' him confused with Douglas.
I first read The Mists of Avalon around that age, or a little older. I loved it then, though I don't really remember how scary it was.
How about Wrinkle in Time and all its sequels?