The dry remark followed a dramatic few days for Britain that have seen the prime minister resign, the pound hit a 30-year-low, and England defeated by Iceland in a shock football rout.
Next came Elizabeth's two-day trip to Northern Ireland, where she met with leaders including Martin McGuinness, a former Irish Republican Army paramilitary who now serves as deputy First Minister of the British-ruled province.
"Hello, are you well?" McGuinness asked as he extended his hand in greeting to the monarch in a televised meeting.
"We've been quite busy. There's been quite a lot going on."
More From This Section
It wasn't clear whether her comments were a reference to political events in Britain -- or possibly her two recent birthday celebrations.
The queen, who turned 90 this year, added that she had been busy celebrating "two birthdays". The monarch's birthday is celebrated twice under British tradition.
Elizabeth has not issued a statement on Britain's vote to leave the EU, a shock result that has strained the ties of her United Kingdom.
Voters in Scotland and Northern Ireland backed remaining in the bloc, but support for an exit in England and Wales carried the victory for "Brexit" by 52 percent.
McGuinness' Sinn Fein party, which wants Northern Ireland to leave the UK and unite with the Republic of Ireland, quickly called for a vote on Irish unity following the Brexit vote.
After an audience behind closed doors with the queen, McGuinness refused to comment on whether they had discussed the referendum.
London's Indian-origin deputy mayor for business, Rajesh
Agrawal, described the event as a "landmark" for UK-India ties.
"UK and India have a shared history on so many fronts. Celebrating 2017 as a UK-India Year of Culture is a big landmark. In the last 20 years India has progressed a lot and our relationship needs to be constantly refreshed," he said.
"I was born in Hounslow (west London), a British kid who grew in New Delhi and then moved to America and thenended up onthis TVshow ('Big Bang Theory')and all mydreams came true. So it's really come full circle to be invited by the Queen," US-based Indian-origin actor Kunal Nayyar said.
British Indian actress Ayesha Dharker said she was "completely overwhelmed" to be part of the event.
"This is a great occasion to celebrate the shared history of India and the UK. The English language is the best example of that and I often refer to it as a great Indian language that unites us all," said Tamil actor-filmmaker Hassan.
The projection was designed by Studio Carrom, a Bengaluru and London-based design studio.
"We wanted to ensure people knew this was about India but which would also surprise and intrigue people, encouraging them to follow the UK-India Year of Culture," said Studio Carrom.
The celebrations kick-start a year-long calendar of events and exhibitions across both countries.