I've never had a sick chicky before. I have a 5 month old Silkie who is having runny amber colored poop, acting lethargic, and tonight I discovered her sleeping outside the coop away from the flock. I just tonight started Poly vi sol (w/o iron) in the flock water. I have 4 other chickies who are not showing any symptoms. Should I separate her? Do I need to find a vet? What help can I give my poor little Silkie?