Does your mother possibly have a problem with drugs? Does she still work in a hospital? Sometimes people with drug addictions (such as narcotic type drugs) work in healthcare because of easy access to drugs.

I had a friend who worked as a nurse aide in various nursing homes, and she seemed to have money issues, she would go around and beg everyone she knew for cash. And get angry when they wouldn't give it to her. She has all the hallmarks of an addict. They never have enough money, and you never know what they do with the money they get.

Just an FYI, Costco sells Omeparole (or a generic version of it) at a good price, if you can get a Costco membership.