Avian vets will have special tools that can look in their ear holes better than we can. Also, if you can afford blood tests and such they can rule out other options. There are many possibilities that we can't even think of. Maybe it's neurological, but maybe it is something treatable?No sign of an ear infection. Probably just neurological issues she’s struggling from.
You might Google "exotic animal veterinarian," if that turns up nothing search, "farm vet," because some will see poultry. We have several near me, but I had to search for them.