Hi Chuckie
It sounds to me like your future mother-in-law suffers from something other than just manic depression. I am manic/depressive and luckily do not suffer from the maladies you talked about.
If she won't take meds, I am not sure what you acn do to help her.
I am sure others will be along who will have more ideas.
Glad you are here, there is a lot of support happening around here.