Mother’s Visitor Visa on New Passport.

[ADewan103]

Hello All, Can somebody please help me to understand visa requirement for my mother, i am a canadian pr and got my mom a visitor visa but her passport is expiring soon i.e 23 december 2018 and she wants to stay here till january 2018. She already has got the new passport, can i apply for another visa when she has not even travelled on her previous visa? is the new visa going to be from 24 december 2018 onwards ??