Also, doesn’t Canada have a king now? Do they still recognise the UK royalty as heads of state, or did that change

OP isn’t talking about our old gal Lizzie, they’re talking about the queen of Canada Romana Didulo, who leads a QAnon-based cult and tours around Canada with them in an RV. Here’s an excerpt from her Wikipedia article about her claims to the throne:

Though Didulo did not initially explain the basis for her claim to be the Monarch of Canada, she later clarified that she had been “appointed” to that position by an American named David J. Carlson, purportedly the “Commander-In-Chief” and “King” of the United States. Didulo claims that Carlson appointed her after she led in 2017 a mission against the Chinese communist military, who were allegedly occupying Canada in underground tunnels, where they were producing adrenochrome, trafficking humans and planning to start World War III by attacking the United States.