Well, I figured that would be essentially what would happen--her coming with it, that is. She keeps her soul gem with her at all times because she needs to clean it after using her magical girl powers so that she doesn't become a monster. She doesn't know that yet, though!

But I'm wondering if this is the only "power" they can't or won't control -- can't because it's her soul, won't because the gem's useless without a body just like the body is useless without a soul.