It isn't a bad story at all--the fantasy of living in a library is appealing, though I'd imagine I would be itching to go out before I was 17 (I have my hermit moments, but not THAT bad).
Two critiques mentioned earlier do strike a chord though--it did feel like the first act of a bigger story bloated into it's own. That can work sometimes (the movie Unbreakable comes to mind), but it did kind-of prod along for a bit. I also have to agreee that a library without patrons isn't really a library at all, and the librarian's motivation to shield themselves from the world because of EVIL EVIL technology did spring as hollow to me (but hey, I'm more of a sci-fi guy, so I guess that makes sense). I wonder if it would have been less dragging if it was a still open library with the magic hiding just underneith the electronic scanning devices, where she lived in the magic portions, and found herself interacting with other kids that live in the real world? But I digress.