My late Dad, had that.
He was seeing a Retina Specialist/Surgeon.
Not just an Opthalmologist.
Anyway, per your city, you NEED to look for any "association for the blind/visually impaired." Because... they will have resources and/or information for you and your Mom.
Here is a link per the State you said you live in:
http://www.vabvi.org/
Click through all the links, to look for resources.
My Dad could not drive either. Nor work. Of course. Because he couldn't see. His vision was very poor. To say the least.
We, had to all do it for him and drive him and do care-taking of him. He also had other health issues etc.
YES, it is very hard, for the person to adjust to.
Your Mom lives in an assisted living facility. That is good.
But like any "elderly" person, they may feel very apprehensive about it. Their whole life, is different now.
So try to understand it from her point of view and feelings.
Allow her to talk about it etc. and be a comfort for her.
My late Dad would say, that I was the only one... that he felt most comfortable with, even if he had all these health issues. Because, I still treated him, as a person. And still allowed him to be himself. Instead of treating him like a "handicapped" person. And I didn't talk "at" him.
I would also HIGHLY recommend, that you get your Mom a medical bracelet. So that, others will know she has a medical issue. Her eyes or whatever else she may have.