It is ossible she should go for a second opinion as I think going blind in one eye is something they need to addresss what did the Doctor say about it? did they have any diagnosis?
Wow...that almost sounds like stroke symptoms. My mother in law gets something like that and they call it, Global Transient Amnesia. They have done tests on the arteries in her neck to check for blockages, etc. They put her on aspirin and I think when this happens blood thinner. But, don't take anything, just have her present the idea to her doctor.