A visiting visa is only good for the specified time,immigration canada could give you more info but they are pretty shrude with thier tactics as far as sending people home.
In most situations people marry in forign countries,the citizen returns and then applies to sponsor-3/6 months+ there is alot of red tape to go through so your best bet might be to find out all your info from immigration,let her return home and visit her until all the details are covered.
some immigration lawers will give you a to-do list for a modest amount.
I'm still learning on the fly but my wedding is in the phillipeans this summer.
Good luck.