She would be asked why does she want to visit in Canada and she needs to give an honest answer.
The honest answer would be : I wish to travel to Canada to meet my boyfriend (Your name) who is a full-time student at York U. She could show some photos or text messages to prove your relationship. (Highly unlikely they would ask).
What you should note that she should be able to convince the officer that she does not intend to stay in Canada after expiry of the permit legally or illegally and other things come into the picture when one has to convince the officer.
Things that confirm 'no intention to stay': Solid financials, a solid reason to come back (children, still pursuing a hot career, business in home country, ill-parents, there are just some examples) and most important: a set itinerary and confirmed return tickets.
If she already has a stamped US/UK/Australia/Schengen visa, it will become easier for her to obtain a visa.