Hi jlp . . .
I read an article recently that identified a general problem. People constantly tapping into news channels for the latest disaster and reinforcing an apocalyptic outlook. It's been identified as motivating a rise in doomsday cults, conspiracy theorists, as well as mental health problems and suicides. Obviously, an aging JW has got a big head start, but one thing is sure . . . it's definitely not healthy. It's hard to do anything in your situation except to keep an eye on her and stick to uplifting subjects I guess.
I couldn't find the article in question . . . but this one makes some valid points . . .
http://www.thespoof.com/news/magazine/doomsday_preppers_cause_world_wide_panic_10808.htm