Mother’s preoccupation with death

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My mother, who is early eighties was diagnosed with mixed dementia last year, Alzheimer’s and vascular, at home and my father just about coping!
The main issue is her preoccupation with death, every conservation turns to her discussing her funeral plans and how she wishes she was dead, to be honest she was getting like this before diagnosis.
My concern is the contact she has with my young teenage daughter who has ptsd after witnessing an attempted suicide a few years back, at the moment I don’t take her to visit as my mum will talk about her morbid thoughts in front of her.
Not really sure what I am asking to be honest, just wanted to see if this is normal dementia behaviour.

It is normal, In the sense that Dementia sufferers obsess about one thing over and over again. I think you are right to keep your DD away at present. It is very wearing and even worse for you, I think, as it is such a depresssing subject she has chosen to focus on.

Yes it's normal from what I've seen, it's good to keep your dd away. Has she actually made a Will and written down her funeral wishes.

It is normal. Is your Mum on dementia medications or other meds? Have you spoken to her doctors about her obsession about death. My mum got a cocktail of dementia meds, anti psychotic etc and eventually we got her mindset in a better place. It does take some tweaking of the drugs to get it right, but medication can help.