I'm honestly not sure.
I feel like it would probably have to be after the timeskip since I do want it to be a Brerratic god. 
Maybe when Crow gets summoned by his father, Penelope goes with him to the castle for some reason (maybe as a messenger for the barons to their new king and to report?) and on their way they stop at that pond they visited before. Then she could have the interaction there and potentially get another message to deliver to the king about the threat of the northern kingdom?