One of my hens has been acting strange since yesterday. She has been sitting a lot, and was even sitting in a bowl of water. I thought she may be egg bound, so I brought her in, let her soak in a warm bath, gave her calcium, - the usual egg bound regimen. This morning she has not laid and egg, but did have some very nasty looking and smelling poop. She is still just sitting like she was yesterday. Any ideas what may be wrong?