I can only back up what the others have said. My friends Mum started with this. At first she became confused about whether she had taken her tablets (she was diabetic). It escalated to the point where she would literally be ringing every minute asking if she'd had them, even though my Friend and her Husband and two carers went in everyday and made sure she took them. If they told her she had taken them she would get aggresive and start arguing she hadn't. She started swinging for the carers. It was a truly dreadful thing to see as she had been such a strong Woman all her life. If the Authorities have told you your Mum needs residential care then that's the road you need to go down. My Friend was left for too long without help, eventually her Mum ended up in a diabetic coma as she was putting her meals in the Freezer rather than eating them, she refused to eat while anyone was there. My Friend was distraught and eaten up with guilt but she couldn't be at her Mum's 24/7 and that's what she needed.