My sister is a JW and the answer is you can’t. They are programmed in the way they discuss religion that attempts to lead you to the answer they want you to give. The best thing you can do for her is love her, pray for her, and set an example that shows her that what she is being told about you and your faith is untrue.
I disagree. They can be dealt with. The problem is that most “Christians” can’t articulate and defend their faith let alone challenge another.
On a few occasions I had them get up from my table, curse at me, and demand I unlock the door to let them out.
Do this AFTER you've whacked her upside the head to get her attention!