Most likely... she hasn't figured out the secret of this place.

[And if Ryou doesn't know, he's not going to tell him, either. Glancing away, he yoinks a slice of the beef.]

Don't look so afraid. 'He' won't let your body get destroyed. Letting you die would be detrimental to him after all. If anything at all passes between the realities of our existence... it must be that.