When I say driven out I mean driven out by the Adversary and his forces. Though it is possible that she came after everyone else went on the first go, but it would be incredibly difficult because the Adversary's forces would of been trying to kill her as she left. The Adversary wouldn't just let someone leave without there being a darker purpose for doing so, like if they were a spy. Anyways I'm getting off track, what I am trying to say is that she either left with the main group of people or managed to sneak past the Adversary's forces, which would of been a suicide mission.