A friend has a hen getting bullied by his 10 or so others. We have only 3 and could take her but I am so hesitant to rock the boat. Our 3 get along and range during the day; we have a small henhouse with covered pen which they like enough to hang out in even when not locked in. But....I want to help our friend and, even more, his poor pecked girl. He is a little casual about cleanliness and his hens have a big pen but don't free range. I am concerned about health of our 3. I'd be distraught if we unintentionally introduced something (I have heard that some people are very careful about this-is this mostly those who keep large flocks?) that killed or made our girls sick. If we introduced them with chicken wire between them to get them used to each other, what further precautions would we need healthwise? And for how long ? How would we know if she had issues that would sicken ours if she is healthy? As well, if she has been pecked and has scabs on her head, will this encourage ours to peck her too? Ours are in the latter stages of their yearly molt which makes them a bit skittish anyway. Not sure if this matters in terms of altering their habits/number/general M.O. thanks.