Thank you for posting your query.
First of all, I would advise to get a CT scan
of the brain done for your mother in law (if not already done), as she had a fall, and these symptoms could be due to internal hematoma
Otherwise, she needs an evaluation by a psychiatrist
to decide regarding the need of anti-psychotic medications.
Dr Sudhir Kumar MD DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad