That shower scene was out of tone and uncalled for. Why show her sleeping in the shower? So we can see a bunch of naked girls, of course. If this was a more fan service filled manga I wouldn't mind, but I would normally be okay reading this in public and that scene came out of nowhere and had little to no value.
And it's an interesting detail that the watch prevents her entire soul from being sucked from her into Chrno. It makes sense that when unsealing it her soul will flow to him and leave her body in that context.