The referee for the Canada-USA game will be Kateryna Monzul of Ukraine.
https://en.wikipedia.org/wiki/Kateryna_Monzul
She'd very experienced and considered one of the best so I don't think there will be any funny business. She's reffed since the 2007 women's world cup. She refs in the Ukrainian men's league.
She reffed the opening game back in Edmonton at the 2015 World Cup. Canada got a penalty to beat China 1-0
And the reffed the final in Vancouver which USA defeated Japan 5-2.