I think there's a pretty clear move from "barkingly insane and immoral" (Let's Kill Hitler) to "quirky and capricious but basically reasonable" (Pandorica Opens) to "dealing rationally with difficult situation" (Silence in the library).
Oh, she's definitely less crazy between Let's Kill Hitler and Pandorica Opens. I'm not convinced between that and Silence. I'll have to rewatch to be sure.
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Hmm... nothing about her when she's younger. When she's older though (the earlier appearances) her behaviour was more stable and responsible.
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She seemed pretty unstable there to me, presumably because she knew this was the last time she'd see him.
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I'd like to see them under non-insane conditions before I make a judgement as to whether they are ever actually rational.
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