One of my bantam hens has runny orange/yellow droppings and sneezes quite often. The hen has had this problem before but it cleared up by itself quite quickly. I've left her for a couple of days but this time the sickness has continued. The hen is not yet at POL. I raised her as a chick myslef, she has been off heat and happily living outdoors for a few weeks. The rest of my flock seem healthy. Does anyone know what's wrong?