Don't you think that if this elderly passenger was REALLY not well and the husband was concerned he would have taken her to the infirmary rather than leaving her ALONE in the cabin while he went to the Muster Drill?
If not her husband, then at least when the crew who went to check on her, if they had seen her in even a little distress or uncomfortable, at this woman's age, they certainly would have taken her to the infirmary to be checked on by a nurse or doctor. They would not have just arbitrarily put them off without sufficient cause. There has been no reports that I know of, that once off the ship, she was seen by a doctor for not being well. Or that she was so traumatized by the incident that she went to a doctor, E.R. or hospital.