Final answer:
During the high fever of the Spanish flu, some people experienced hallucinations and delirium.
Step-by-step explanation:
The high fever of the Spanish flu caused some people to experience hallucinations and delirium. This symptom is known as delirium tremens and is a severe state of confusion and disorientation. The reference to the lady thinking her mother's hair was a cat could be an example of the hallucinations that some people experienced during the high fever.