Selina managed to get out a "Wha-" before Castiel laid his hand upon her. She let out a whimper, more from surprise than true pain. After a moment she realized she held a very angry cat, and finally let her onto the floor, where she zipped off into the bedroom, hissing.
She breathed heavily, staring hard at Castiel.
"I don't know how they do things in the afterlife," she finally spat, "But you do not lay your hands on a woman before you ask permission,"
She straightened, and tucked a stray hair behind her ear. With a few more deep breaths, she regained her composure as if nothing had happened.
"Demonic detection," she repeated sardonically, "I don't have to carry a vial of holy water, do I?" She brushed past Castiel, and into the living room. Down to business.
"When do you want this done?" she called from the next room, gathering her tools together. Hopefully Joan would believe she had the flu for the third time.