It is really good, but one thing I have learned to appreciate is that some books just don't work for many teenagers yet. Classics in particular! You need quite a large frame of reference (history, geography, societal issues and classes) to be able to appreciate a novel written in 1844 which takes place in France in the decades before that. If a book doesn't work at 12, just let it be and find something more accessible for her.
Nothing kills a long time habit of reading better than being forced to read novels that don't (yet) work for you.