Hi,
Thank you for posting your query.
Her problems could be related to another minor brain 
stroke. This can be ascertained by a neurological examination and repeating MRI brain.
Her 
hallucinations could be a side effect of 
amantadine, or due to parkinsonism, especially a type called as diffuse 
Lewy body disease. In this condition, tremors, slowness and memory disturbances may occur.
I hope it helps.
Please get back if you require any additional information.
Best wishes,
Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad,
My personal URL on this website:  http://bit.ly/Dr-Sudhir-kumar 
My email: drsudhirkumar@yahoo.com