Terrible in split.

I thought she was good. In the scene when [spoiler]they first woke up in that room and she was advocating for all three of them to attack the guy, I remember thinking "finally someone using some sense in one of these movies". Too bad they didn't listen, but then there wouldn't be a movie.[/spoiler]

Funny, M Night actually did a good job directing this movie. And despite some slouchy dialogue, Haley's deliverly and reactions are believable.

As already mentioned, the scene in particular where she's trying to get the other girls to help her attack their abductor was refreshing and well-acted.