Hi openheart,
my non-JW wife is bi-polar as well, it's been incredibly hard over the years so I understand your pain.
My advice with regards to your wife would be to talk to a professional, the sooner the better. Talking to my wife on my own ended up in endless circles that just repeated every time she was at the top or the bottom of her mood cycle. You need that dispassionate outside viewpoint to break the cycle.
Good luck,
Matt