The Queen's daughter, Princess Anne, has been attending the Society of Heads' Annual Conference at The Vale Resort at Hensol. The Princess Royal made no comment about the Queen's health as she met Headteachers from Independent Schools at the conference in the Vale of Glamorgan.
The 86-year-old monarch had been receiving treatment at the King Edward VII Hospital for Gastroenteritis. She left hospital on Monday afternoon after being admitted on Sunday.
The Queen has cancelled a visit to Swansea as she is "experiencing symptoms of gastroenteritis", a Buckingham Palace spokesperson has said.
Queen Elizabeth II was due to make the trip tomorrow.
"She will be assessed in the coming days", the spokesperson said, adding "Her Majesty is currently spending the weekend at Windsor, as usual".
The Queen has cancelled a visit due to gastroenteritis, a royal spokesman has said.
A rehearsal is taking place for a military fly past on Saturday over Windsor. The event involves around 60 planes that will be taken part in celebrations that mark the beginning of the Queen's Jubilee weekend.
Young volunteers from St John Ambulance in Crosskeys speak about their first day of tree-planting in preparation for the Queen's jubilee.