How do I deal with MIL’s hallucinations?

95% of my mother’s dementia symptoms were hallucinations and delusions. The earliest sign of trouble was when she was sure a man who lived in her apartment building was staking her. She became so upset one night when she thought he was trying to break into her apartment that she tripped and fell and wound up in the ER. When I moved her to a facility, the hallucinating and delusions ramped up. Her room was an apartment in Chicago. She was a famous New York stage actress. A “young boy” was riding his bike down the “street” outside her “apartment” and stealing her underwear, then waving it around as a prize. It got worse from there. I often told her I would speak to the charge nurse, who she really liked and that she would tell them to keep away from her (my mom). Of course I said nothing to the nurse, but it seemed to placate my mom for a spell. When your mom makes an innocuous remark about someone in the driveway, just agree and go on about your business. Acknowledge that she’s said something but don’t explain it away or run to the window and then try to convince her there’s no one there. You can’t. In her mind, it’s very real. It’s an obsession. She will eventually move on to something else.