This is not the case and her daughter is very hurt because of the accusations and also the state that her mother has worked her self up into.
she gives her a certain amount each week and then pays bills out of the rest of the money. The reason why she does this is because of the fact a lot of her money went missing.
https://www.agingcare.com/articles/How-to-handle-alzheimers-disease-lying-144204.htm
It's a problem and not easy to sort out, but when dementia is involved, the patient can not always be taken at their word, unfortunately.