"They checked her eyes (again) & still everything is perfectly fine - she just can't see & her eyes weren't tracking anything passing in front of her eyes"
HAHAHAHAHHAHAHAHAHAHAHAHAHHAHAHA [HMM]
Since when is everything perfectly fine if you 'just can't see' and your eyes don't track anything passing in front of your eyes?
What these people need to be explicitly clear about with you, is that regardless of origin, it is NOT perfectly normal to have vision disturbance or loss, and it is NOT an over-reaction to want further investigation if a deterioration in eyesight becomes NO eyesight.
I used to work on a breast surgery ward, and saw first-hand how nurses and care assistants and surgeons went about their daily business, forgetting that for each of these women this was their world turning upside down, and this was new.
These people need to remember that just because they've seen this or something similar before, you haven't, your DD hasn't, and whether psychological or physical, it is REAL.