Oh dear I am sorry to hear this.
The answers are unwelcome but as far as I can see are correct.
You cannot claim rent from the govt if the landlord is your daughter or else everyone would do it. I think it is LHA ( local housing allowance)
pension credit is here
https://www.gov.uk/pension-credit/eligibility
It looks as tho you get made up to £712 a month which frankly isnt much to live on.
rent but it has to be rent can be claimed for and is around £600 a month (manchester) but that doesnt give you anymore
and yeah the future looks bleak