I have a 2 year old EE hen that started wheezing and occasionally hiccupping today. She only does it after running. I read that it may be impacted crop (it was hard) or something stuck in her throat so I gave her some olive oil to try to loosen things up. She has had access grass and hay since she is free range. She seems fine otherwise and eats just fine. None of the other chickens have these symptoms. I found a video that is exactly what she is doing. Any ideas on what is going on?