Camilla was forced to pull out of engagements last week and missed the Remembrance Day commemoration events over the weekend.
She is attending a Booker Prize reception with shortlisted authors at Clarence House on Tuesday, her first engagement since she became unwell.
But she will be there for a shorter period than planned, joining guests only for a discussion and a group photograph.
Camilla will still join the King at a special palace reception on Wednesday celebrating the TV and film industry, but she is not expected to stay for the entirety of the engagement.
The Queen has also pulled out of the royal premiere of Gladiator II on Wednesday evening in London’s Leicester Square where she was due to meet Paul Mescal, Denzel Washington, Connie Nielsen and Pedro Pascal, and director Sir Ridley Scott.
The changes to her diary are understood to have been made to protect and prioritise her continued recovery, with royal doctors keen to prevent any setback from a nasty seasonal illness.
The Queen was said to be disappointed not to be able to join the royal family including the King and the Princess of Wales at the Cenotaph to see the veterans parade in remembrance of the servicemen and women who paid the ultimate sacrifice.
She observed the two minutes’ silence privately as she followed the proceedings live on television at Raymill, her Wiltshire house.
Royal doctors ruled out her attendance during the commemorative weekend, urging Camilla to take a few more days rest to fully recover after she caught a seasonal bug following her long-haul trip to Australia and Samoa.
There was also concern she might pass on the illness to others, with the King still undergoing treatment from cancer, and Kate recovering from the disease.
Tuesday will be the first time she has been seen in public since the end of her long-haul to Australia and Samoa two and a half weeks ago.
Thursday is the King’s 76th birthday when Charles is marking the day by opening the first two Coronation Food Hubs – one in person and one virtually.
Camilla, 77, had hoped to join him, but the visit will remain a solo one.
Meanwhile, a documentary focusing on the Queen’s work raising awareness of domestic violence aired on Monday evening, with Camilla watching the final edit for the first time at her Wiltshire home Raymill.
She is said to have been delighted by the end result and the impact it appears to have had.
The Queen was followed over the course of a year for the ITV1 and ITVX programme Her Majesty The Queen: Behind Closed Doors, and in it she vowed to ‘keep trying’ to end domestic violence, describing it as a ‘heinous crime’.
.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.