My hen has been resting in her nesting box, and has been acting different. I noticed her crop was full of food, so I gave her olive oil and massaged it. It seems to be better, but her trachea seems very thick. She is stretching her head up and looks like she is gasping for air. This has been going on for four days now. We assumed it was because she was impacted with food. But now I'm questioning gape worm. I looked down her throat and don't see anything. But tonight she sounds like she is wheezing. How do you tell if that is what it is, and how do you treat this? Is she contagious around my other hens?