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Her appearance in that episode and her momentary appearances in several other episodes of Series 4 were part of the build-up to "Turn Left" & to the 2-part series finalé, "The Stolen Earth"/"Journey's End". Those cameos by her showed two things: 1) that she was trying to get in touch with the Doctor & 2) that (as the Doctor put it) "the walls of the universe are breaking down and that puts everything in danger -- everything!"

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