In one of the episode she got hit by a bomb and her spirit went into Dao's body because her own body was too weak too support it and it need to be heal first. The monk in the cave told Dao that her body is strong enought to hold another spirit and she need to find Jak a new body until her old one heal. So they put her body in the cave where they saw the monk because they think the cave have some kind of power that can help Jak's body heal and protect it from going bad. In another episode they found some crazy girl with no relative at the beach. When the girl die, Jak went into her body. That's how she got her new body. Next week episode, she should be getting back into her old body.