I came home last evening from caring after my sick father for a few days, while my friend fed my chicks, to find one of my girls with a real yucky bottom. She's always laid kind of weak, soft eggs that have recently been showing a ring of blood. My friend at the feed store says as long as she's eating, drinking and playing, it may just be her nature. I went to inspect her this morning, her vent is red and swollen and pulsating, although she has already laid today. It appears to be slightly leaking as well. I've separated her from the flock and I'm watching her closely. She is still eating and drinking and not acting sick. Could it be an infection?