The 95-year-old queen took a break after she was hospitalized overnight last week, "for preparatory examinations", according to the British court.
On Tuesday, Elizabeth held both a video conference and spoke with recently accredited foreign ambassadors from her current residence at Windsor Castle.
With the right of age, the queen has for the first time been seen using a cane in public, and instead of going to Glasgow, she now needs to follow doctors' advice to rest, according to the court.
The Queen will still give a pre-recorded speech to the participants in the climate meeting.