Hi,
Thank you for posting your query.
Your mother needs to be investigated to find out the reason for 
paralysis. A brain scan such as MRI would confirm the location and type of blood clot in the brain.
In addition, she should be screened for risk factors such as 
high BP, sugar, 
cholesterol, 
homocysteine, etc.
If we treat her risk factors and use 
aspirin, we can prevent the recurrence of brain stroke.
I hope my reply has helped you.
I would be pleased to answer, if you have any follow up queries or if you require any further information.     
Best wishes,
Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad,
For DIRECT QUERY to me:  http://bit.ly/Dr-Sudhir-kumar 
My blog: http://bestneurodoctor.blogspot.com/