Hi,
Medicines take time to react to the psychotic symptoms. Continue with the medications, because it’s not working dosent mean it will not work.
All the family members also need to be patient enough, do not try to give explanations and proves to her delusions. It will take time to break them.
Next Steps
If it is uncontrollable, I suggest you to consult a psychiatrist,
Health Tips
I suggest the family members to have a family therapy session and have a psycho education session with a psychologist.