I have read that ACV can affect a birds ability to absorb calcium properly, so do stop adding it to the water as GrandmaBird suggested. Honestly, even an 'avian specialist' vet tends to have more of a clue about exotic parrots than things like chickens or quail. So I doubt it would be worth your time or money trying to find a vet. You can only do the best you can and give her every chance to get better, which you are.