Well she would be subject to Canadian income taxes through whatever vehicle she contracts to appear that engages in her activity here....unless there is a USA CAN tax treaty provision (dunno). Provinces participate with economic spinoffs locally in sales and its own citizens increased income taxes but not sure they get that "vehicle's" income taxes. Canada of course has part (5%) of that national sales tax and fingers in other tax pots.

Could also be somehow creatively more favourably structured even...dunno really how she is taxed.

Professional athetes definitely face a complex structure with border crossings but they do not worry about anything but their game as business managers do the heavy lifting.

If writing ever becomes work I think I'm going to have to stop