I'm surprised nobody mentioned the scene where she comforts Anakin on Tatooine after his confession of killing the sandpeople. It was such a beautiful interacting between Nat and Hayden! Her compassion made his agony come across even better. Not that Hayden's acting was amiss even a bit there. That's like one of the most powerful scenes for me in the whole PT. A close second Padme scene would be the window scene in ROTS. But most people seem to like that anyway.