Dark Energy, by Robison Wells
Five days ago, a massive UFO crashed in the Midwest. Since then, nothing, or no one, has come out. If it were up to Alice, she'd be watching the fallout on the news.
However, her dad is director of special projects at NASA, so she's been forced to enroll in a boarding school not far from the crash site. Alice is right in the middle of the action, but even she isn't sure what to expect when the aliens finally emerge. Only one thing is immediately clear: Everything has changed.