Applying for a 3-yrs tourist visa

[mehmeh]

I got my PR visa approved and plan to move to Canada a few months from now.  Is there any possibility that my mother would be granted a 3-yrs tourist visa and come with me at the same time?  I already have a job waiting for me over there.  If she was granted only 6-months visa, I would then have to accompany her back to our origin country after her visa expired which is really very difficult for me.  Please help!  Thanks!