Ok so the most common ear issue I think is humidity, until you get a humidifier you can also Mist the cage lightly with a spray bottle of just plain water. Don't spray directly on the glider though.
However there are other possibilities,
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One is a parasitic, ear mites or bacterial infection. Another is a circulatory problem that isn't allowing enough blood to get to her ears.
Ear mites can be treated with Ivamectin administered by the vet. They can be very hard to see by the naked eye. Ear mites live on almost all living things, when something happens like stress it can affect the immune system. When the immune system is lowered it can give the ear mites a chance to infect the host.
Without being seen by a glider experienced vet it's really difficult to say exactly what the problem is, I would think the most obvious would be the humidity issue. If addressing that doesn't improve or at least stop the damage from worsening I would see a more knowledgeable vet. Unless the glider has been under stress, then I would get to another vet immediately.
Personally I would have thought that even a non glider experienced vet would be able to recognize ear mites, since they affect all other animals the vet is probably more familiar with.
I had a horse that had an ear mite problem and for her the vet told me to swab her ear with oil to "smother" the mites. I don't think that is the right approach with gliders though as their ears are very small and delicate I would worry it would do more harm than good.