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Only a little of this has been revealed. We know that she was abducted by the Silence when she was a baby ("A Good Man Goes to War"), so that they could make her into a weapon against the Doctor. We also know that they kept her for some time in an old (supposedly closed) orphanage in 1960s Florida, from which she escaped & (somehow) made her way to New York, where she regenerated ("The Impossible Astronaut"/"Day of the Moon"). Finally, we know she subsequently reached 1990s Leadworth (though we don't know how) & grew up with Amy & Rory ("Let's Kill Hitler").