[ManicWolf]

How is she "playing the saint?" Is your view of the world so cynical that it's too hard to think there might actually be genuinely nice people out there? From what I saw of last night she was laughing in the way you do when you feel awkward or nervous, which is perfectly understandable in the situation. If she really doesn't fancy Freddie, and she's just been told he fancies her, she was probably feeling bad about it and laughing to cover up what would be an awkward situation for her.