Well, just got back from the vet. The doctor is going to run some tests and get back to me tomorrow, but she said Kiwi LOOKS very healthy. Nothing wrong with her preen gland, no irritated skin, and all the feathers are coming back in just fine. She gave me two things to give Kiwi, one is a supplement for healthy feather growth that hopefully Kiwi will take voluntarily, but the other is an oral medicine I have to give once a day to help with any skin irritation that could happen considering that there's hundreds of little feather shafts coming in simultaneously. The visit was only a couple hundred dollars, which was better than I was expecting, anyways. So I'll hear about the tests tomorrow. We still don't know why Kiwi decided to pull out her feathers.
Birds are weird.