Aziraphale nods, marginally unimpressed but mostly unperturbed. It's probably for the best if she keeps to herself. He wouldn't want any humans to try to take responsibility for her and reap the possible consequences.

"ALl right," he says. "Well. Welcome, I suppose."

He hesitates - is he really going to just walk away? - but there's no much else he can offer. He slides his weight back to one foot, then pivots slowly and starts to walk back toward the Base.