What about the Nancy Drew mysteries, or Little House on the Prarie? Both are aimed at her age. Good Reads has a YA list that is bound to have some of what she would like. Some like like trash for a teen, but there's some good in there too.
I am with Michael that reading above your level brings you up. At her age I picked up A Tale of Two Cities and The Count of Monte Cristo. Somewhere in there, I picked up The Three Musketeers.
They gave me a life long love of (semi) historical fiction! Find stuff in the subjects she likes and she'll manage to read the material.
We actually have Little House as an audiobook, so she's not interested in reading it, since she's heard it that way. I have broached mysteries like Nancy Drew as well, but she doesn't like books that are just about normal life; she likes there to be a fantastical element about the book. For example she really likes Dianne Wynne Jones. I agree that the key is finding something that she is interested enough in the plow through. I actually gave her The Picture of Dorian Gray, which was a little bit of a challenge for her, but was short enough that she didn't get discouraged with it, and she enjoyed it very much. She's reading the Lorien Legacies series right now, which isn't classics quality to be sure, but it's not junk either.
I was super into historical fiction as a kid too, but it's not something my younger siblings have enjoyed like I did. Dickens and Dumas are definitely too far out of her reach at this point, but I read Tale of Two Cities and Monte Cristo as a teen as well. I have Three Musketeers, but I've never gotten around to reading it yet. Monte Cristo is one of my all-time favorites. I have the Penguin Classics paperback, and the book is so large that it's not holding up well. I was planning on getting myself a hardcover edition for Christmas, but the cover art that Penguin has out right now is really kind of ugly, and they have the best translation so I guess I'll just have to wait.
Good suggestions Kathy, my fifth grade teacher read the Little House on The Prairie when I was in the fifth grade. She would read a little each day after lunch recess, which was a great time to do so. Recess in those days was a big deal for we kids. We had about 45 minutes of rip roaring, hard playing, good times. When we came to class from that time, we were tired, quiet, and attentive. I really enjoyed her taking the time to entertain us in such away.
I am of the opinion that recess being taken away from kids is a big part of why many don't do well in school today.