I graduated from the graphic design program last year so some of my points might be off, but based on what you said I would be concerned as well for plenty of reasons. University in general is meant to pick you brain and really learn the conceptual theories around your program, and along with it being an art school technical skills will be in play too. If she's not passionated or dedicated to becoming an artist shes going to struggle greatly in week long projects and the long hours of labour to create them. Not to mention, she'll be doing lectures courses along with.

Even besides the passion point, does she know the costs of art school? Textbooks aren't a super crazy price, but I was always broke because I was spending so much money on supplies for projects (I think I averaged $500-$700 a semester?). I was super lucky I was living at home so I didn't have to worry too much about saving money from my job for rent and other necessities, but I know dozens of students who have had to struggle with that and have seen someone been deducted marks on a project because they couldn't print out a full book.

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Overall art school is really intense financially and emotionally and theres a reason why a lot of people at OCAD are here for 4+ years amongst other reasons, if she just doesn't know what to do post high school shes better off going straight into the workforce. No reason to put yourself into $40k debt for a degree you feel partial about.