Aggression/difficult behavior that is a result of delusional ideas is difficult to deal with. I am not sure what you identify as a 'delusion' in this case. From what you say she appears realize she is not in her own house but is being asked to stay somewhere she does not want to stay. However here are a few caregiver tips that may help you;
The nature of delusions and the way you cope with them will vary from person to person and also need to be adapted to the stage of Alzheimer's.
Keep in mind that delusions are 'fixed'. This means any attempt to argue the case only causes more distress to everyone and does not result in them changing their mind.
Try to think about the situation. Does the suspicious behavior occur more at different times of the day, for instance in the evening, or at night? Could tiredness, darkness and poor lighting, isolation and fear associated with being alone make their paranoia worse? See if there are any circumstances or routines that you can change that may reduce their paranoia.
Reassurance is very important to help reduce concerns, although they will probably not stop their delusional belief. It will not necessarily help telling her the truth.
Tell her she is safe and direct her to her room. Simple short answers, do not argue with her. Complicated explainations will not help.
Keep routines familiar
Because Alzheimer's is a degenerative condition this phase will change. Contact her family doctor if her levels of anxiety are very high. Small doses of medication may help her and you get through this stage of the disease.
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