My beautiful dominique hen has a yellow face. She did have a nice red face up until about a month ago. When I noticed I began giving her vitamins, but she is still yellow. She doesn't behave like she feels well. At one point I put her up in quarantine. She ate and drank okay so I let her back out. I thought with time and supplements it would go away. Has anyone out there seen anything like this? Here is a picture of what she used to look like to compare. Sincerely worried about my girl. I would appreciate any information.