Dean, Sam, and cas are in the Men of Letters Bunker hanging around because there are no cases at the moment. They here a knock on the Bunker door and Dean goes to answer it

Dean: “Ye— Charlie?”

Sam and Cas over this and rush over

Sam: “Did you say Charl— holy crap! Charlie?!”

Charlie: “Hey…” she says as if she doesn’t know how she’s alive either