I'm puzzled. How could she understand the audiologist, if she never heard sound before, totally deaf? Reading lips only? But her own voice is surprisingly articulate, and you can't do that without audible feedback to guide you. I've known a number of deaf and nearly-deaf people, and their speech is always very garbled and hard to understand, not unlike what you hear from some stroke victims.
At the same time, regaining one of our senses is a very profound experience. As I turned 9, and began a new school year, my new teacher's policy was to seat us alphabetically, which happened to place me at the back of the classroom. Previous teachers had seated us by height, shortest to the front, which I was.
This new teacher noted I was unable to read the blackboard from the back, and advised my parents to have my eyes checked. I didn't know anything was wrong, because this was the vision I always had, my Mother constantly scolding me for wanting to sit right in front of the TV on the carpet, worried about the theory that these new TVs could damage your eyes. I had nothing to compare my vision to, what I saw was what I assumed everyone saw, and never complained.
A couple of months later I got my first pair of eyeglasses. And on the way home from the eye doctor's in the dark of that winter evening in Mom's car, Christmas lights were already lit on stores and homes. And I saw them clearly for the first time in my life, no longer indistinct blurs of color. And I cried & cried for joy, until we got home, it was all so beautiful & unexpected, a new world.
And then I ran all around the house, looking at things I always knew, but really for the first time. And seeing the TV sharply. It was many days before I got over the novelty of seeing. In school I had to endure the "4-eyes" mockery of my classmates, the only one with glasses, but I didn't care. The miracle of seeing was worth it.
But my Mother later told me my eyesight had been ruined by sitting too close to the TV, in defiance of her admonitions. She always did have a problem with cause & effect.
So I kinda understand this a very little, though parts of this vid do make me dubious.