Sandy and the Winchesters

After Dean Winchester saved Benny and Sandy (OC) from purgatory, Sandy slowly starts to remember who they once were and how they had gotten to purgatory...
What will happen when Chuck and Amara get involved? What happens when Sandy discovers the truth? Or when Amara discovers that Chuck has lied to her? And how will Castiel react to Annalise (Sandy), when he hasn't seen her since he was a very young angel in heaven?
I do not own supernatural. I do own Sandy.