When was Monica Lewinsky “cancelled”? The closest to that would be the negative treatment she got from Clinton’s reflexive defenders in the late 90s during the scandal, but that's substantially before the supposed sudden, recent emergence of “cancel culture”, and her current profile rather undercuts the catastrophic descriptions of “cancellation”.
Almost every realistic description of cancel culture and its actual effects will undermine the narrative, because the need to spread fear and hatred of the left by overstating it and its scope has caused the dialogue around it to spiral out beyond hyperbole into batshit insanity.
But yes, Monica Lewinsky would definitely be considered "cancelled" by today's standards. Any form of public backlash is considered cancel culture, now.
I've found articles about her speaking on college campuses with her anti-bullying campaign. I've not found anything about her being cut off from platforms yet. Can you post a link?