Thanks for info. Not familiar with their form of governance.
As a constitutional monarchy with a parliament comprised of the Sovereign, the Senate and the House of Commons, Canada’s form of government is among the most stable and enduring in the world. With an evolving role that predates Confederation, the governor general acts on behalf of the Sovereign, Canada’s head of State.
The governor general’s responsibilities include carrying out constitutional duties, serving as commander-in-chief, representing Canada at home and abroad, encouraging excellence and bringing Canadians together.
So. as I see it, Elizibeth II herself would have to instruct the GG (Mary Simon) to sack the PM, and dissolve Parlaiment, then call new elections.