Update on Billie Jean:
She’s still alive and is slightly better than when I first discovered the issue a month ago. So, doing much better than her worst. I let her back in with the rest of the flock because I think the loneliness was doing her more harm.
She still walks around like she’s drunk, stumbling backwards, and is roosting on the floor, but she’s holding her own with the other chickens, happily eating and drinking, and dust bathing, and isn’t getting worse. She’s just… stable.
I stopped all forms of treats for the entire flock, and have them strictly on layer feed. Just in case it’s a nutrition issue. However the rest of the flock is doing just fine.
The entire flock is getting water treated with either Rooster Booster Poultry Cell, or Rooster Booster Liquid B-12 out in their runs. I’m just doing the bottle recommendation of 1oz per gallon. They also have a waterer with plain water inside the coop.
As long as she seems happy and not in pain, I’m not going to cull her.