Well, aliens is new. The rest is... okay, then. She nods slowly, and it's perhaps a bit telling that this is not the most shocking news she's had today. If they're talking Biblical angels, that's pretty uncommon. The definite article before the Devil is... Hmm.

"Lucifer? What, uh, what does he look like?" she asks. She doesn't want to accidentally bump into him. While she thinks she would probably notice soon enough, it's good to know more.