Hi,
I had no problem in using that COPR, if IRCC has confirmed the reception of documents that means they have made the changes in the system but it’s not reflecting in COPR. You can travel with the existing COPR, she should carry The print of emails where you informed about marital status change, reception email, wife’s passport and PR card print and marriage certificate print. The immigration officers will ask you again at immigration to confirm marital status please do not lie about being single, because the system is reflecting married status. Inform that you are married and you had informed twice about it, present all the prints, they’ll call senior immigration officer then he will check the documents and correct the COPR or just circle the marital status with a pen and they’ll let you enter Canada.