My 2 to 3 year old hen yesterday had a strange neck position. I picked her up to feel her crop/neck and a bunch of yellow green foul smelling liquid came out of her beak. At first I thought it was a neck/ head injury. This morning she was having very labored breathing. Could this be sour crop gone bad? I gave her a dose of colloidal silver as that was the only antibiotic I had on hand that I knew would be safe. Any help is greatly appreciated!