If Nadriina is annoyed that he doesn't believe it's her, she doesn't show it. "This... well, this is a dream. It's a bit more potent than the typical dream-sending spell, but... that's getting technical, and I'm sure you're in no mood to discuss the philosophy of dreaming and dream states. The simplest explanation is, you're back home, in your domain, and recovering, and I'm able to reach you by walking the dreams. You're home; really, truly, and honestly."