I am worried about my new hen. I took in a bird who had last her flock to a dog and was looking for a new home. She is haivng a rough introduction. My girls make her sleep on the door step and wopn't let her on the roost at night. Whan I was cleaning out the coop I noticed that her droppings were very different then the ones under the roost. Black, runny. Is she sick? She's been with me for about a week.