It could be that Wu's place of temporary exile was not that of the other concubines at all, but a special dispensation, perhaps to keep her close to her lover, the new emperor, like a modern mistress sequestered in a nearby apartment. Certainly, if there was ever a cessation in her affair with the new emperor, they were back together within a couple of years, since she had given birth to his son by 652/3. Her hair, supposedly, magically grew back.