That's an awful situation Hunni. If there is no family to intervene then I suspect she has to be allowed to stay there until she dies. She has to live somewhere. Sounds as if she would be eligible for a residential care facility or a dementia facility, but there would have to be a needs assessment and a financial assessment, and Te Whatu Ora would need to step in. I don't think the property management bears any responsibility other than ensuring the safety of her present flat. Here's a link to some information:
https://info.health.nz/services-support/...ement-6311.
https://info.health.nz/services-support/...ement-6311.