My 4 year old Rhode Island Red seems to have some trouble breathing. When she breathes, you can hear a whistling/wheezing sound. She also 'yawns' a lot and opens her mouth while pushing her neck forward. When she sleeps, you can see her inhale and exhale in an uncomfortable manor. She is currently an indoor chicken, (she is the only chicken left when our flock was attacked) and I don't think it is normal for an indoor chicken to breathe like this. What is wrong with her? How can I help her? *Update* she keeps letting out a low screeching sound i dont know whats wrong please help!