If she wanted you to know about her health or medical conditions, SHE would contact YOU. She doesn't, so therefore it's none of your business and doesn't warrant any sort of contact whatsoever.
When people show you how they are, believe them. She's shown herself as a judgmental ASS, so damn sure believe that's what she is.
And yeah, I've been there with in-laws (non-JW's) who were manipulative narcissists. You get to the point where you say, "I've had enough of this shit! Good luck with all that!", and then promptly exit - FOREVER.
Contacting this heartless wench will only end in pain for YOU. Somehow, someway, they'll use it to poke at you and make you feel like a subhuman being. Been there, done that.