The 95-year-old monarch is following doctors’ orders to rest after undergoing preliminary tests in hospital last week.
It has not yet been confirmed whether the head of state will definitely carry out the high-profile engagement in Glasgow on Monday November 1, but it remains listed as a future engagement on the royal family’s official website.
The Sun reported that Sunday’s service was the first time she had missed prayers at Windsor’s All Saints Chapel since she returned from her summer break at Balmoral.
The head of state’s trip to central London’s private King Edward VII’s Hospital, which began on Wednesday afternoon, was kept a secret but the Palace issued a statement on Thursday evening after The Sun newspaper broke the news.
She was admitted to King Edward VII’s Hospital on Wednesday for her first overnight stay in a medical setting in eight years.
The Queen was said to be “knackered” due to a busy social life and her preference for late-night television, as well as a hectic schedule of engagements throughout October, royal sources told the Sunday Times.
Buckingham Palace kept the Queen’s stay in hospital a secret, saying on Wednesday she was resting at Windsor and in good spirits after pulling out of a Northern Ireland visit.
Aides issued a statement saying she had undergone “preliminary investigations” at the private clinic after The Sun revealed the hospital stay.
It is understood the head of state was due to attend for only a short stay while she was seen by specialists, so the development was not announced by the Palace at the time, and protecting the Queen’s medical privacy was also a consideration.
The monarch, who is head of the Church of England, is a devout Christian and regularly attends a service each week, although during the Covid crisis she opted for private prayers with a chaplain.
She is likely to have worshipped this Sunday by receiving private prayers in the tiny private chapel inside Windsor Castle, where the Duke and Duchess of Sussex’s son Archie was christened in 2019.
Buckingham Palace has declined to comment.