Prior to her hospitalization, Queen Elizabeth held a dinner with world leaders, including Prime Minister Boris Johnson and Microsoft founder Bill Gates, at Windsor Castle on Tuesday evening. Additionally, she participated in a virtual meeting with Japanese ambassador, Hajime Hayashi, and the EU ambassador, João Vale de Almeida, according to The Guardian.
The 95-year-old monarch appeared to be in good spirits at the gathering, where she was joined by Prince Charles and Prince William.
Though Queen Elizabeth has stayed busy with her royal engagements, royal watchers noted that she used a walking cane for the first time in 17 years last week. She used the cane as she attended a service marking the Centenary of the Royal British Legion.
According to The Guardian, Queen Elizabeth suffered a knee injury in 2003, which required her to undergo surgery to remove torn cartilage from the joint. After recovering, she stopped using the aid for walking in public.