From what point has Canada been a monarchy in its own right?

The Crown has stood for the state in Canada for 400 years. From Confederation in 1867, Canada has had its own constitutional monarchy. Queen Victoria was on the throne in that year. The Crown does not mean only the Sovereign. It stands for the whole machinery of the state. That includes Parliament in Ottawa, the provincial legislatures, the courts, the police services, and the Canadian Forces. When you see a crown on a badge or a building, it points to that shared authority.

Queen Elizabeth II became Queen of Canada in 1952. A jubilee marks a long anniversary on the throne. She reached her Golden Jubilee, fifty years as Sovereign, in 2002. Her Diamond Jubilee, sixty years as Sovereign, fell in 2012. These anniversaries were marked in Canada as well as in the United Kingdom, because the same person was Sovereign of both countries separately. Canada's monarchy is its own, not something borrowed, even though the Crown is shared with other realms.