She spent a lot of time wandering around the classroom or hallways and doing nothing because she knew she could get away with it.
I wouldn't assume the reason she's wandering/being unproductive is because she knows she can get away with it. It's so easy to think we understand the motivation behind a behavior, and be totally, dead wrong about it. (I'm saying that as an often-chagrined parent).
Here's an example: I recently found out that this one particular stupid thing that got DS in trouble FIVE years ago was because he was covering up something he was self-conscious about. Yes, really, it took him five years to explain it to me.
It's really hard to figure out what's driving behavior, isn't it?
