Do what I did with my mom.
I told her that shunning is a two way street and if she wanted to get on it she had better be ready to accept the consequences of her behavior.
It's funny how they back down when they realise that they are the ones initiating the BS
This is exactly what I did with my superfine-pioneer-now-married-to-an-elder daughter. She never even "bothered" to tell me or her nonJW Dad that she was getting married to Mr elder, we found out because one of our son's thought it was crummy of her to pretend we didn't exist so as not to stain her "spotless and perfect" JW wedding with our heathen presence. (I sent her a nice gift and an "appropriate WTS-approved card "anyway)
This SAME daughter got the phone call the morning I had my stroke and was in the ICU.....and she never sent a card, called any of my other kids back, etc until three months later she calls and says she "wanted to stop by to see how I was doing". My husband told her she was not welcome here any more. If she thought her bahavior was the proper way to "honor her mother and father", then we wanted no part of her OR her religion.
You have to wonder what makes them tick when they think they can trample all over other's feelings and expect OTHERS should wait with open arms when they "decide" to act human.