Let's Get Lost — Sarra Manning

Isabel is the girl who rules the school with an iron fist and a gang of minions who do her bidding. Her friends are scared of her, her teachers can't get through to her, and that's just the way she likes it. With her razor-sharp edges and tall walls, nothing gets to Isabel--and no one, but no one, is ever going to discover her dark, sad secrets. Then she meets Smith. And Isabel learns that sometimes when all the expectations and pressures are too much, you just need someone to help you get lost.