Buckingham Palace says she's been advised to rest and carry out light duties.
The 95-year-old will still contribute to the summit, delivering an address to the assembled delegates via a recorded message from Windsor Castle.
UK correspondent Gavin Grey told Kate Hawkesby it comes as concerns grow about her health and workload.
“Lots of people are now going to be intensely reviewing how she looks and what she’s doing and how many royal engagements she should be trying to do.”
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