Mom is 88 and was has been diagnosed with ALZ. She has delusions of people that are in her and Dad's house. Constantly worrying about the "boy". She thinks dad is the one with the problem "he doesn't remember anything" when asking him about the all the imaginary people. She will also start getting ready to pack to go somewhere, either on a trip or moving and accuses dad of disappointing her by changing their plans. We have a lady that stays with her if Dad is not home and has decided she doesn't like her telling her what to do and doesn't need her anymore. She accuses dad of the same thing, telling her what to do all the time.
Have you talked to the doctor about her hallucinations/delusions? Perhaps she needs to be seen by a geriatric psychiatrist, there could be medications available to bring her back a little closer to reality.