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She received the confirmation of PR upon visa issued on her passport. So, can I still cancel her visa before she landed to Canada ?
 
cancel your sponsorship/undertaking IMMEDIATELY if you don't wish to sponsor her anymore

https://www.canada.ca/en/immigratio...ner-dependent-child-complete-guide.html#forms

May I cancel my undertaking after it’s been approved?
If you change your mind after you submit the sponsorship application and undertaking, you must write us a letter before a final decision is made on the file and submit the letter as an attachment through the IRCC Webform. You can only withdraw an undertaking if we approve the withdrawal.
 
hey bro, did you successfully cancel her visa if yes please let me know how you do it i am in same situation.
 
hey bro, did you successfully cancel her visa if yes please let me know how you do it i am in same situation.

Contact IRCC via webform and would even suggest phone asap. This is a time sensitive situation and ask to withdraw the sponsorship.