I'm so glad to hear that she is happy with the hearing aid! Now that she has had a couple of weeks to adjust, how is she doing? I know that it FEELS more noticeable than it LOOKS. And always saying "Huh? WHat did you say?" or responding wrong to someone else is way worse than wearing the hearing aid. My problem even with the aids was with whisperers - I imagine that might be frustrating to a teenager, since they all whisper!
Keep your options open - right now if the dr. doesn't know what the problem is, let her use the aids. If her hearing gets worse, or they develop a new treatment, then I would look into it. She is fortunate that she has options right now. Advancement in hearing aid technology seems to be moving at light speed, so she has good reason to hope for hearing without hearing aids sometime in the future.
And what was it my mom used to say when I was a teen? What doesn't kill you makes you stronger. Going through this experience will make her more compassionate and understanding of those who are different, and strengthen her character more than being "like everyone else" in middle school (although I am sure she doesn't want to hear that now!)
You should also check into available technology in her school. We have a child with hearing aids in our building, and his teacher wears a mike that can speak directly into his ear, while blocking out other noises - this is just one of the settings. My audiologist said all the new buildings in Allen are wired for this technology. You can check into this with your daughter's school and they will be very discreet.
Let us know how your daughter is doing! It can be hard, but she may be surprised how accepting others can be when they see that it's "no big deal"!