She is somewhere between 3 and 4 months old i believe. An ameraucana. Over the last little while she seemed a bit light on her feet, if you nudged her she would almost topple over, and as of the last 2 days she has gotten worse. She hangs her wings down as if she doesnt have the energy to keep them up. she was a bit crusted over on her nostrels. Seems to breathe wierd from her mouth, and since i got her like a month ago, she hasnt really gotten any bigger and the other I got with her is noticibly getting larger and healthier. I seperated them now, not sure what to do or what could possibly be causing this. She has been outside living in a coop since i got her,, and we have had a few cold nights, i wasnt sure if that could be the culprit. she eats alot, and drinks fine. I am just trying to figure out what typically causes these symptoms. Please help me save my girl. . . .