waddling like a duck

[4reds]

One of my chickens is waddling like a duck. Her cone is a pale red, she seems to be breathing heavy, and the area under her vent is so large it is almost on the ground. She is still active and normal acting other then what I have mentioned. Any suggestions?

 

[Kevin565]

Maybe eggbound

 

[4reds]

How do I check to see if she is?

 

[Kevin565]

Lightly feel her abdomen to see if it feels hard