Castiel nodded. "I will take her to Dean. He can look after her." He moved closer to Jo's prone form, kneeling so he could place a hand on her arm. "Thank you, Ellen."
Of course he couldn't have told Dean what he needed the amulet for. But hopefully Ellen would be able to make proper use of it. Castiel only knew it was important.
A moment later, there was a rustle of wings, and both Castiel and Jo vanished.