She ran away the other day but came home right before bedtime. She seemed fine until the next day I noticed my other hens pecking her butt. She had big clumps of orange/yellow goop stuck around her behind. And her vent area was swollen and looked out of place. I washed her off and cleaned her vent area with saline solution. But she's not eating or drinking or walking around. I got her to drink a little water by dripping it right on her beak and I've separated her from the others. What do I do?