http://www.cic.gc.ca/english/study/study-who.asp said:In some cases, you do not require a study permit to go to school in Canada.
* If you wish to study in a short-term course or program
You do not need a study permit if you plan to take a course or program in Canada that lasts six months or less. You must complete the course or program within the period authorized for your stay in Canada.
how does it work for Canada for the PR holder in the US?Leon said:Yes, a PR in Canada doesn't mean anything for the US so she would still need a visa to visit you.