Ah, that's too bad. It's hard to watch them suffering.
My last dog was deaf a good year before she died. In hindsight she was losing her hearing for a good year before she went completely deaf. Of course, it wasn't until the day that she actually was fully deaf that I realized how bad it was.
I am writing to give you hope. A deaf dog CAN lead a good life. There will be times, in the beginning (especially in the early weeks of complete deafness - if it comes to that), wherein your dog will be scared often. She will tremble and whine. And all you can do is comfort her and let her know you are near.
Start using hand signals with her now for certain things so she gets used to the "sign" language you start with her. Also...this is going to sound weird but....if you talk into her head it will help her to relax and feel normal. What I mean by that is......get your lips right onto her head, on her skull, and say familiar phrases to her. Things like, "go outside, wanna go for a walk", or your pet names and phrases for her. There is something about the vibration of your voice against her skull that allows her to "hear" and understand you. I know it sounds odd but it works and it brings them some comfort.
Also, be careful about startling her when she is relaxed or asleep. If you come up on her she might fear lunge or jump and you don't want to get bitten. It's not her fault but, still, be careful. I found that when my dog was asleep I would so gently caress her to get her to wake up.