OP, re the accusations about staff, my mother went through a phase of telling me every time I went that ‘They kill people here!’
It was so difficult trying to reassure her - it was a lovely care home. She wandered a lot at night, and what I suspect is that on one such wandering she saw a newly deceased resident being taken away.
I dare say your mother has seen another resident kicking off or hitting out - it will happen in the best of care homes, if dementia is involved.
People with dementia often muddle up something they’ve seen on TV, or have dreamed, with real life. My mother was once convinced that she and her cleaning lady had taken my father’s dead body to a graveyard many miles away, and just dumped it. (!) It was a dream, muddled up with something on TV the night before. She was terribly distressed for 48 hours and nothing I or the cleaning lady said could convince her.
However, knowing what I learned later re dementia, I should have just said, yes, I knew, but it was all right, it had been seen to, he’d been properly buried now. (in fact he’d been cremated, but these things don’t matter a toss when you’re trying to avoid distress by going along with their reality.).
Another time she became convinced that a sister she’d never got on with very well, had ‘stolen’ their mother’s house. It went on for ages and a signed and sealed statement from the Lord Chancellor wouldn’t have convinced her - he’d only have been ‘in league with’ the aunt and me! So eventually I just started saying (over and over, she never remembered) ‘Dear me, that’s awful, I had no idea, I’ll get on to the police/a solicitor first thing tomorrow.’
In other words, please don’t ever worry about being economical with the truth, if it’s going to avoid distress or anxiety. Say whatever will keep her happy for the moment. In dementia-carers’ circles they’re called ‘love lies.’
Over the years I became amazingly adept at these!
All the best.