we got some week old chicks 3 weeks ago. we tried to foster them to our then broody hen but she didn't take them so they have been isolated in a dog cage since. they've only ever been out in the yard twice. we've been pretty careful about not touching them after handling our older hens. today my mom noticed one of them is breathing really heavy and her wings droop when she walks. she mostly just sits and her friend stands over her. when i picked her up she didn't respond she doesn't move a lot when i poke her. we had a hen die 2 weeks ago. we thought she was egg bound. could this be avian flu or something else?