Mom had brain cancer, a mets from a previous beast cancer. Followed by WBR. She does get confused with poor memory but nothing significant. The last week she keeps saying someone is coming into her house at night. Stomps around. Turns on a light then leaves. Nothing is amiss or moved the next day. We live way out in the country. Our house is right in front of hers. No one has been here. Can WBR cause hallucinations? She is convinced of what she saw. Not sure what to do.
The best way to handle this is to acknowledge the problem. Offer to stay overnight with her so that you will be there when she "sees" things. If you stay over, you'll be able to figure out what the trigger for her hallucinations are or if there really is a burglar taking advantage of the situation. If the hallucinations become a problem, a good healthcare professional can help.
We had a family friend who reported someone had broken into his house. They had not. Later, he said children were playing in his house and making noise. He left the house due to the noise, fell in the street and broke his hip. So, I would take it very seriously and figure it out. I wouldn't leave her alone until that is done.