Get her care needs reassessed. Basically if she has night care needs - reassurance or active help say to point out its still night and go back to bed , then, in theory she qualifies for redidential care.
I say do it now because you have time to look / get assessments and move her for a " bit of a break" without it all being urgent.
She's probably going to be more easy to settle now rather than later and the " sales" points of a good home - entertainment , good food, trips out with the family etc mean things to her.
If you need guidance re how the money works I'm unfortunately pretty knowledgable having done it in the past year.
My dad thrived in care for much of the last year of his life - he ate better , got stronger , did more and actually probably got more out of life than the last 18 months at home with mum who was getting sicker herself.
He died 6 weeks or so ago of his dementia , well looked after to the end by the carers he loved and who loved him ( having known him when he had a personality and sense of humour rather than just in the terminal phase ). Yep it cost loads but was worth it . There were minor niggles - lost hearing aids and teeth being the memorable ones but they turned up and were nothing thinking back.
Search my threads. ( I was Theas18 pre hacker gate name change ). The lovely team here supported me through it all so there are lots of threads on the ups and downs !