I saw her eating yesterday and getting in and out of the pool but this morning she was too weak to get in by herself but she was eating like crazy when I offered her food. I put poultry vitamins and electrolytes in her water and since I didn't know what was wrong I also gave her some water with charcoal incase it was something she ate but I noticed she was breathing with her mouth open as if she was hot so I put her back into her pool and she seemed to like it better in the water. I still believe she has a problem breathing because her tail is moving up and down when she is resting like she's having some issues with breathing. Long story short ( I found out about Tylan from this site ) and I gave her an injection of Tylan 50 at 8:30 pm and put her back into the coop with the others but separated her from them with a gate. She was stressed out enough and wanted to be with her flock. I hope I did the right thing. I have 15 ducks all two years old and one year ago I lost a runner overnight and now this fear is haunting me. Millie came to me blind in one eye. I just lost a dog a few weeks ago and do not want to lose her too. I put food and vitamin water in with her overnight. Any more suggestions would be greatly appreciated.