I am caring for my mother with the help of a nursing agency. My mother has extremely negative reactions to one of the nurses and screams at her to get out, and is convinced that everything is the nurse's fault (she is causing her rash, poisoning her, contaminating her creams, etc). When I try and explain how things really are, she gets angry at me for taking their side. Why is this, and how should I best deal with my mom at these times. I understand that she is in a confused state either because she's just woken up, hypoxia, dehydrated or needing to eat (diabetic), but why does she focus on one person.