The palace statement said she is “expected to make a full and swift recovery” and that family members are monitoring the 73-year-old’s condition.

“The King has been kept closely informed and joins the whole Royal Family in sending his fondest love and well-wishes to The Princess for a speedy recovery,” the palace added.

Anne was expected to appear alongside King Charles, Queen Camilla and other royals this week as the family welcomed the emperor and empress of Japan for a state visit. All of her previously planned engagements have been postponed, a palace spokesperson told People.

Anne and Laurence ride in a carriage after attending the Order of the Garter service at Windsor Castle on June 17.

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Anne’s incident comes at a tough time for the British royal family. Kate Middleton revealed in March that she had been diagnosed with cancer after undergoing abdominal surgery in January.

The Princess of Wales recently made her first public appearance in six months at Trooping the Colour in June, one day after updating followers on her treatment and condition.

“I am making good progress, but as anyone going through chemotherapy will know, there are good days and bad days,” Kate said in a written statement shared with the public. “On those bad days you feel weak, tired and you have to give in to your body resting.”