Doesn’t sound like she’s had any success in getting a sneak preview of what’s to come, nor negotiating any tariff carve-outs for her province or for Canada generally.
I don’t know offhand if America has surplus domestic oil reserves sitting idled at higher marginal production costs that could become profitable to bring online if WCS oil eats tariffs. I.e., if it becomes 10 or 15 or 25% more expensive for American refineries to import Alberta oil, could that allow for, say, shale oil or gas deposits to become profitable to develop where they currently aren’t? That would run a risk of long term supply substitution away from Canada. We’ve seen how Alberta bitumen oil can be profitable to extract or not, depending on spot price. Assuming tariffs would equally hit other potential sources of oil imports (which is not necessarily a safe assumption, but I’ll go with it to reduce variables), tariffed Canadian oil will need to compete with America’s potential to increase domestic production.
If America tariffs our oil, but does not impose equal tariffs on other overseas producers (say someone in another oil producing country succesfully curries Trump’s favour), we could end up in a really bad place indeed.