Camilla, Duchess of Cornwallis taking some time to rest and recover due to an illness.

The Duchess, 72, was forced to miss a gala dinner at the London Library on Wednesday night after she recently contracted a chest infection,Hello! Magazinereports.

Wednesday’s event in London was held in honor of the 200th anniversary ofPrince Albert‘s birth. He is believed to be the library’s first patron after it was founded in 1841, according to the outlet.

Camilla, who currently serves as the vice-patron of the library, was expected to give a speech before the dinner and meet some of the writers from the library’s Emerging Writers Program.

Chris Jackson - Pool/Getty

Camilla, Duchess of Cornwall

The Duchess is also set to appear at the 91st Field of Remembrance service at Westminster Abbey on Thursday, alongsideMeghan MarkleandPrince Harry.

While there, the group is scheduled to lay a Cross of Remembrance, visit memorial plots, and meet veterans across all branches of the Armed Forces.

The royal engagement will also mark their first official appearance as a trio, but it is currently unclear if Camilla’s sickness will force her to miss that event, as well.

Meghan Markle and Prince Harry.

Meghan, Harry

Prior to falling ill, Camilla stepped out withQueen Elizabethlast month to attend a service at Westminster Abbey to mark 750 years since Edward the Confessor’s original church was rebuilt under the reign of King Henry III.

They watched as a bouquet of roses was laid at the Shrine of St. Edward the Confessor on behalf of the monarch, and treasures from the Abbey including a fragment of the shroud from the shrine of St. Edward the Confessor was laid on the High Altar.

Yui Mok/PA Images via Getty Images

Duchess of Cornwall; Queen Elizabeth II

BothQueen Elizabethand Camilla received posies as they left the landmark.

Westminster Abbey is a special place in the royal family. In addition to serving as the location forKate MiddletonandPrince William‘s royal wedding in 2011, it was also where Queen Elizabeth had her coronation in 1953.

It’s rare for the Queen and Camilla to step out withoutPrince Charles, the monarch’s eldest son and Camilla’s husband of 14 years.

However, the monarch has been showing the future queens the royal ropes, including an outing in March when Kate joinedQueen Elizabethat King’s College’s Strand campus for theirfirst-ever joint appearance.

source: people.com