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It was never stated directly that she did but, in "Let's Kill Hitler", she said, "the last time I did this, I ended up as a toddler in New York," so either there were two regenerations in New York (possible but there's no indication of it) or the regeneration we saw at the end of "The Impossible Astronaut" was the one that turned her into Mels (highly likely but not quite certain).Yes. Before regenerating, Mels said that she had regenerated into a toddler the last time she regenerated. The little girl regenerated in New York into a toddler and somehow made her way from America to Leadworth in order to grow up with Amy and Rory.