I just want to give you some hope.
1.
There is a commerical on tv about a family, it goes something like we had our first two children blah blah and then with our third she couldn't hear and blah blah they were the first family and the first child to have a pediatric cocinar(I can't spell that) transplant and now she can hear us. I believe it was with the U of M or something.
2.
My daughter's dad was partially deaf as a child, had major speech problems. They didn't find this out til he was probaly schoolage or close to. They did surgery in his ear, something was to big or blocking or something. He now has normal hearing, and has overcome any speech problems and is a successful adult with a awesome corporate job.
3.
There is a girl in my daughter's first grade classroom who has hearing aids and wires that run down the back of her shirt. My daughter plays with her and communicates with her just fine. She's in normal mainstream class and seems to fit right in.
I'm glad you listened to your mom instincts and had things checked out. Hopefully things will be ok, if she passed her newborn screening maybe it's just a small problem.And you've caught it early enough to intervene before she starts school and all of that. You could start signlanguage now regardless if your child will need to sign or not. I did signlanguage with my daughter at around that age and she picked up on it so fast, and she was so good at it. It helped alot with communication is she hungry? Does she want something?
I know my mommy instinct told me something wasn't right with my daughter and she ended up in physcial therapy and because I got on the ball with it early enough so we had corrected her problem before she started kindergarten and noone would ever guess anything was wrong with her.
Let us know what happens with her next appointment we'll be thinking of you guys.