I wish she was smart enough to think in long term.
She is super short-sighted, as you can tell.
You might want to explain this to her....
What goes around comes around. If you cut of ties with your parents, your kids will cut off ties with you. How would she feel if her children cut of ties with her because their spouse felt that she was interfering too much in their life when all she was trying to do was share happiness? I would use this approach.