My one remaining Rhode Island Red was acting funny today. I saw what looked like blood on her swollen backend. Put her in a 110 F bath to clean her. Maggots started floating up in the water. Definitely a prolapsed vent. I applied Preparation-H to the vent and tried to push it back in. It wouldn't stay; kept popping back out. Here's a picture. I've got her in a crate covered with a towel in my workshop. She only lays an egg every two or three days that have very fragile shells. She's also almost three years old. Should I cull her or do you think she will get better? Not a pet.