I am very sad for your mother
I don't know the protocol for treating strokes, but after my grandmother had one, there wasn't much the hospital could do but monitor it. It took many many hours (over 24) for a neurologist to see her, for reasons I still don't understand.
But apparently, once the brain has been damaged from a blockage, treatment would be to minimize the chances of another stroke, and it's "wait and see" as far as the results of the stroke (not much can be done to prevent the symptoms, such as paralysis.)
You could try to talk to a lawyer who specializes in medical cases to find out whether a standard of care was breached. Maybe someone here will have some idea why things were done this way at this hospital?
My heart goes out to you and your mother.