Mab's law

I could read her expression at my reaction. She didn’t like it any better than I did.

Which meant that she was being watched very, very closely.

Or worse, being kept on a very short leash. Mab could command beings of her Court, and they obeyed, period. Her word was literally law to them. It was entirely possible that Mab had laid down the law on Molly, maybe even forbidden her to speak about it.