I've had a hen that from day one has had a gurgly sound to her. Since she grew well, ate well, acted fine and showed no other signs of illness, I didn't think too much of it. Yesterday I noticed she had a bubbly eye so I separated her from everyone else. I figured I'd see how she was today before medicating. This evening she was gasping for air in a similar way that chickens w/gape worm will do only this had the gurgly sound too. Shortly after I found her making these noises, she died. Does anyone have any idea what could have been wrong w/her?