Secret Signals
Have you noticed that the Queen is always carrying a handbag? It's not that she has much in there, but rather that the bag is used to communicate with her staff. When she shifts the bag from one hand to the other, it means she wants to end her current conversation and a staff member should pull her away with an excuse.
This is even more urgent if she twists her wedding ring, which means they need to take immediate action. Finally, if she puts her bag on the table, it means that she wants to leave an event within the next five minutes.