My mom is suffering with parkinsons related dementia. She has major hallucinations. Tonight we were watching tv together and she suddenly came towards me very agitated. She thought I was having relations with my dad (he is deceased). I couldn't calm her down so I left the room. She also thinks I'm stealing from her. I have to say it really makes it harder when the person you are caring for full time is not happy with you.
This may be obvious, but have you spoken to her doctor? It seems that a lot of these doctors put them on the same regimen of pills for years without any review of them whatsoever - and if your mother sees a doctor on her own she will not be able to run down the list of them nor tell him/her how they are affecting her.
Maybe it's a good time for a review with the doctor and you and your mother to see if any of her medications are causing this frightening and adverse behaviour?
something else to distract the behavior. You see your mother but it's not the mother you used to know. Good luck to both of us.