Hi,
Thank you for posting your query.
I have noted the symptoms in your friend.
Episodic loss of memory can be seen with TIA-
transient ischemic attack (which occurs due to lack of blood supply to brain) OR seizures (due to abnormal electrical discharges in a part of brain).
She would require
MRI brain and EEG for further evaluation and confirmation of diagnosis.
There are good medications available to treat both these conditions.
I hope my answer helps. Please get back if you have any follow up queries or if you require any additional information.
Wishing you good health,
Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad, India
Click on this link to ask me a DIRECT QUERY: http://bit.ly/Dr-Sudhir-kumar
My BLOG: http://bestneurodoctor.blogspot.in