Berrygerry, I can see why you are so concern about your mother. My thoughts are your parents may not be getting the right nutrition. Living in Florida for 40 years and being in mostly elderly congregations we would see from time to time older ones going off the deep end. Nine times out of ten after they got medical care it was found out they was not eating right. Their body chemistry was all out of whack. I remember one old fellow his wife had just died after a few months he was doing crazy things. After getting him to doctor we found out he was eating nothing but turnips.
It may be something else but you may want to look into this. The mind can really play a lot of tricks on us if it is not being fed properly. Then you add the crazy teachings of the cult you can see how this may be happening. I know this experience really sucks and I feel for you but there may be a reason for her thinking. I hope this can help. Take care. Still Totally ADD