Hi
@pj53
People with dementia start to live in their own reality
The scenario you outlined sounds very much like moderate stage dementia - especially the way she thinks that spies are coming in and stealing things. Thinking that others are stealing from you is so common it is almost diagnostic!
My mum thought that her ex-cleaner was coming in through the letterbox and stealing from her! In reality, of course, she was moving things around and putting them "somewhere safe where the ex-cleaner wouldnt find them" and then forgetting.
Does she watch a lot of spy thrillers on TV? Many people at this stage of dementia think that what is happening on TV is actually happening to them. So if she likes spy thrillers this may be the source of this confabulation.
Mind you, if this has come on suddenly, it might be worth checking whether she has some sort of infection - especially a UTI