@mamascrazy, when I receive conflicting advice, I dig deep, think about my own bird’s behavior & personality, along with flock dynamics when evaluating the input. I have certainly separated sick birds before, as I believe sometimes that is best for the situation at hand. Let us know what you...
I agree boosting her immunity would be good. However, I personally would not remove her from the flock, since that may stress her out and they’ve already been exposed. Have you checked her crop function? It should be full before roost and empty first thing in the morning.