Canada has rejected US extradition requests before.

Canada law doesn’t allow extradition if the prosecution is politically motivated. When trump said Meng’s case could be part of a trade deal, it shows the political nature. Yet canada chose not to reject the request because of US pressure.

I'm sure they could have found an excuse to avoid arresting her. The US would have been angry, but that would have blown over quickly. Instead, the Canadian government has gotten itself into a situation in which it's facing intense pressure from both China and the US, and will alienate one or the other country, whatever it does. It would have been much smarter to avoid being pulled into the middle of the US-China trade war.