If I remember correctly, she still would have died even if she hadn't been jettisoned - the ship would have crashed and she would hardly walk away from that. That makes her unsalvageable. In standard trolley problems I don't switch tracks, but if there were a way to switch the track so the train killed only one of the same five people it would already have killed, that person is unsalvageable and can be singled out to save the salvageable.