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75. Purse tells her ladies in waiting what she wants

Source--https://www.cheatsheet.com/entertainment/how-does-the-queen-use-her-purse.html/

snip--"Handbag on the table
When the queen places her handbag on the table, it means dinner (or the event) must end within five minutes. That said, ending an event that isn’t yours seems a bit disrespectful — even if you are the Queen of England — so when she is a guest, placing her handbag on the table signals that she is ready to go in five minutes.

If you just so happen to be having a conversation with Her Majesty and she places her handbag on the floor, it’s not good. That gesture signals her ladies in waiting to rescue her from a conversation she doesn’t want to be part of. If it’s not possible to place her bag on the floor, the queen instead twists her wedding ring to signal staff.

Handbag shifts from left arm to right arm
When the queen shifts her handbag from her left arm to her right, it also signals staff that she’s ready to move on. The queen typically carries her purse on her left arm so that her right is free to shake hands."

And more at article.
Kleenex, lipstick, mints as well, like many other women do.