Tongue thrush on hen

we have a hen who has a disgusting tongue. I’ve been giving her monistat the last couple days because she had like saliva out her beak and dirty feathers (presumably from it dripping) on her chest. Otherwise she seems to be eating and running around like normal. She is a little standoffish from the other chickens, but not terrible. We’d been pulling her out of the coop to give it to her at night so I didn’t get a really good look. Today we gave it to her in the daylight and I realized her whole tongue is gross. It’s all white and slimy itself. Is this oral thrush? Should I continue with the monistat. I’ve been doing once a day, should I do twice per day? I called our regular vet to try to get something called in and they wouldn’t do it because she’s not licensed for chickens. There isn’t a large animal vet around here. Any advice would be appreciated.