Please help me find out what is wrong with this pullet. She is a fresian fowl and about 18 weeks old. She is normally a very flighty bird but the past 3 days her wings have slowly been becoming more and more droopy and low. One side is worse than the other. Today she was acting a little bit too quiet for me so i brought her inside on her own. She is eating well and her crop is full, also keeping up with the others. She has had a running nose and sneezing for a few weeks, as have some of the other pullets she is brought up with. I watched her try to fly up on the perch, she got up there ok but u can see her wing is weak and she struggled but normally she can fly a good few feet! Checked her over for any signs of damage but nothing? I have put life guard in her water for the night, we dont have any antibiotics at hand. Can anyone can suggest what they think is wrong or what i can do?