My chicken has been sick for about 3 weeks or more. When I first discovered she was sick she was staying in the coop. When I tried to push her out her wings would kind of droop to her side. I removed her from the rest of the flock and kept her inside. She sits most of the time when she stands her wings droop and her neck curls down until she sits again. She is eating very well and drinking. Our vet gave her an antibiotic last week for 4 days, but there has been no improvement. The only other thing I can think of is to deworm her. I do not see any worms in her poop. I am hoping the dewormer will not kill her. I have wazine and valbazen. Which one should I use?