Notice from her comments that this woman is a very well-indoctrinated Christian. In her world view this is as close to demon possession
as anybody would ever want to get. However, it is an actual medical condition so rare physician's were quick to make "other" guesses.
Contrast the WRONG views of both the religious person and the scientific doctors in diagnosing the cause of the hallucinations.
Not until actual TESTS were made was the actual source of the problem correctly dealt with.
Food for thought!