On a more serious note though ... there is a pen picture in this little scenario about how different responses illicit different results.
She behaved the same with my SIL who got very upset and hurt and just could not manage to ignore it/calmly make appropriate comments to keep boundaries without giving much attention' or just laugh it off. ( she is a nice woman and we have always got on well, just a very different personality and also 15 years older than me. She would ask me what to do and I would talk her through it and model but but it was just something she couldn't manage, always started crying and feeding the attention wanted, I suppose!)
My BIL ( her husband) was also 15 years older than MrM and a very different personality - , challenging every small thing that it could be possible to be offended by and generally drawing red lines all over the place for his mother to promptly step over. It was his way of dealing with it which is fair enough but not very successful I'm afraid.
They ended up on very very low contact with his parents which seriously upset him regarding his dad and probably would have been completely estranged eventually if his Mum hadn't died suddenly! A shame really.
In that context I don't think the very low contact or even No contact if it become that would be abuse per se, with reference to the OP question.
I am well aware that I could easily have been quite reasonably offended/hurt etc but really couldn't see the point and I was more concerned to focus on Mr M maintaining whatever he wished to with his parents without additional angst!
Maybe that comparison of outcomes might be useful/helpful/food for thought for others who are thinking about how to avoid low contact/estrangement.