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Technically, he can see her again as long as it's before she got stuck in a parallel universe in her timeline, such as in "The End of Time". The reason she can't see the Doctor again (or at least the one that didn't experience the metacrisis) is because she is in a different universe to the Doctor, and the walls between their universes have shut ("Doomsday"/"Journey's End"). While they could possibly be broken down again, as in "The Stolen Earth", this is not an easy thing to do now the Time Lords are gone ("Rise of the Cybermen").