You were very smart to avoid US connections. The US doesn't have normal connections anyway. There is no transit option like in most countries. Aside from the sexual assaulting Nazis at the checkpoints, you have to deplane even for a direct flight, bring your luggage to customs for inspection, and recheck it even if you are getting right back on the same flight to another international destination. All for no reason at all. I guess the US bureaucrats just assume that everyone flying from the US is starting their trip from the US. Idiots. If you don't connect through the People's Republic of Safe States your daughter should be fine. Keep in mind that if she gets selected (by the randomizer mat) in Canada you can always choose to just head back to the airline counter and reschedule the flight for another time when you will have another chance to try your luck on the randomizer mat. As opposed to taking the risk of the the specific CATSA screener she encounters being a "bad apple". As long as you get to the counter before the plane leaves most airlines will just make you pay the change fee (plus any fare changes). For Air Canada that is usually $150 per person.

She could also try wearing an athletic cup to protect her in case the CATSA screener has been trying to emulate the TSA method of sliding their hand up the leg until they meet "resistance" and then some. In the US she would probably have all kinds of unspeakable things done to her which would never happen in Canada. It sounds like you have already read about them.