Yes I believe she can. You would need to speak with the airline to ensure she is known as an unaccompanied minor and they will look after her and ensure she get's to where she needs to be at each transit airport and gate. She need's to ensure she has the correct documentation for the Border officer.
Are you the principle applicant or someone else (if applicable) ? From what i understand the principle applicant must first land or be in Canada.
Here is a little more info
http://www.canadavisa.com/landing-in-canada-as-a-permanent-resident-faq.html
I think perhaps it is best to contact Immigration so you can understand the logistics of when she arrives and explain them to her also.
Hope all goes well.