Welcome to HCM
We understand your concerns
I went through the description and came to a conclusion that your family friend might be suffering from Post Traumatic Stress
). She was suffering from H1N1 and low platelet counts and associated symptoms and troubles.
The stress she went through during the course of her H1N1 illness, must have developed into a mental disorder. I suspect, Thoughts about "what will happen next" and "how helpless I am" etc got her self confidence away.
Please take her to a psychological counselor for counseling support.
There may not be any mental side effects after H1N1.
Hope I am able to answer your question. I can be of further help to you if you desire so.
Get well soon.