Not necessarily misrepresentation. At the time of application they weren't married so no false information was provided. However, IRCC requires every applicant to update them about any change in their circumstances. Getting married is a huge change.Only that won't it be misrepresentation?
I believe she will now need to do a Family Sponsorship application to bring him into Canada as he can no longer be included in her PR application.
That application will go to the bottom of the pile and gather lots of dust before ever seeing light of day.