Honestly, I don't know. I didn't watch it all. But, she seems like an exceptionally strong character. I find it hard to believe that she would take no for an answer.
As for being naive, I think we all know the British tabloid press are the scum of the earth, and what being in the Royal Family would entail. She would have known this. There is no way on earth that she wouldn't have known what she was getting in to. Maybe she underestimated how bad it would be? I can understand her wanting to get away from the British press. But do so with dignity.