Thanks for your experience.
That should give my wife some hope for getting at least some of her hearing back.
There are no guarantees, but if she has Sudden Hearing Loss, your wife will probably get most or all of her hearing back. This may take months. There is a non-trivial chance of some permanent degradation, but this is usually fairly minor. If your wife is a concert violinist with perfect pitch, this would be worrisome. But my doc told me that most people adjust to the new normal without difficulty. If she does have a more severe hearing loss, she might end up with a hearing aid, but that's the exception, not the rule.
Sudden Hearing Loss, of course, isn't the only thing that could be going on, but from your description of your wife's situation, it sure sounds like what I experienced. Good luck.