"It has been a busy period of official engagements for the Queen.
She was pictured hosting a Global Investment Summit at Windsor Castle on Tuesday evening alongside Prime Minister Boris Johnson.
An official record of the Queen's diary showed at least 15 other formal events during October.
On Wednesday, a Buckingham Palace spokesman said the monarch had "reluctantly accepted medical advice to rest for the next few days"."
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She's an amazing woman, still working away at her age. She really needs to slow down.