That hole is not suppose to be there! Its a wound and it needs to be kept clean with a spray solution to reduce pain and infection. Also probably wouldn't hurt to get some antibiotics in her water to prevent infection. Go to your local feed store or tractor supply to get some spray and some...
The best thing you can do is clean the wound with warm soapy water and put Veteran spray on the wounds but if there very bad you might have to sew her up[/quote
Theres only suppose to be one hole back there and thats the poop shooter.
Chickens can be resilient and can recover from major wounds. They've got some spray for chickens at Tractor Supply you can spray on the wound to help healing. I used it on a chick that I had that was attacked by a fox and i thought it wouldnt live and now she's an adult hen laying eggs. Just...