Went out tonight to put my girls to bed and found one lying on the ground with a bloody protruding vent. There was a bloody egg in the box. The egg was not any larger than normal. She is lethargic so I brought her in since it is so cold and have offered water with electrolytes and a cooked scrambled egg, none has been taken yet. She is only 8 months old, what could be wrong? What should I be looking for? I have only had chickens for a year. My girls have been healthy, I have never medicated. Any ideas are appreciated.