I'm a first year chicken owner and for the past 6 months they have been great. No issues or anything, today I go out and see that one of my female GSL is missing a ton of her under but feathers and it's matty and white and wet and has a bloody sack hanging out of her butt. I tried to get her but she wont let me. She is eating and running around fine, but occasionally she will turn around and peck at it. I don't know how to help. If I can at all. Any help? If I can't help her without it costing more than she is worth so to speak I need to know if she is still eatable? As much as I hate saying that it is the way the cycle was meant to go. Any advice would be very appreciated. Sad day!