Help! My dearest hen Lilly, is the only one left from my original flock. I believe she is about 3/4 years old but may be older. She is a leghorn. She has not bin following the rest of my flock around (I have 5 birds) also on the bottom on her it's big like its a egg or fluid. Is she egg bound or what is it? She has bin like this for a little while, she isn't as mobile as she usually is. It's like the big thing in her is dragging her down or is heavy for her. also, if I touch the big thing inside her she opens up her mouth to breathe. Please help !