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The late Queen Elizabeth was last seen officially when she received the new Prime Minister Liz Tuss on 6 September, a picture is included in the post by Beth. Her Majesty appears to wear her traditional pearl necklace, pearl stud earrings, and a pearl ring. It appears she was not wearing a brooch (at least I am unable to see one).

Brooch
I tried to identify her Majesty's last brooch wearing. She arrived at Balmoral on 9 August and there were church services listed in the Court Circular for every Sunday, but I don't´t think she attended those. She is listed as receiving three people in audience on 20 July, but I haven't found any pictures of these audiences either.
Thus, the audiences and Privy Council she held via video link on 19 July appear to have been her last where she was photographed wearing a brooch. The audience for the new US ambassador was photographed, and the Queen is seen wearing yellow and a brooch. Have anyone seen a picture where the brooch can be identified?
Her last public event was shen she opened the new Thames Hospice in Maidehead on 15 July, accompanied by the Princess Royal. For this event she wore an art-deco diamond and aquamarine brooch she inherited from her mother and only started wearing in 2014.

Pic credit: PA Media

Would anyone know what were her last major necklace and tiara events?