First, I am very, very sorry about what has happened to your wife’s hearing. I don’t know that what I have to say is comforting. But I will tell you, something very similar happened to me about 4 years ago.
At that time, I came down with a bad cold that settled in my right ear. During the illness, I assumed I could not hear out of my right ear because of congestion, but after the cold went away, my hearing did not return. Being very concerned about this, I went to an ENT who told me there was nothing he could do now - I was too late. He gave me a hearing test, which recorded the fact that I had lost hearing in my right ear, and he ordered and MRI which ruled out a tumor.
Since that time, I have looked for remedies, but have not found any that made a huge difference. Over time, though, it seems that the hearing in my right ear has improved a little. I can hear low frequency sounds.
If I were in your wife’s shoes, I would try the steroid injections. Some chiropractors also claim that their procedures can bring back hearing.
I know none of this is very helpful. I truly wish I had more encouraging things to say. It really sucks.
I will add your wife to my prayers. If I do find anything that works, I will reply to you again.
Please take care, and may God restore your wife’s hearing.
Thank you, I will let her know your experience.