Thank you. That was the only time I witnessed it, but it has probably happened more often in my coop. I have found evidence of broken egg material, but usually if another hen notices that or an egg membrane sticking out of a vent, they eat them right away. I am not saying that your hen will die, but the egg material inside the vent area can be a medium for bacterial growth. I probably wouldn’t worry too much about it, but just get some for another time. Amoxicillin is a drug that can come in handy while having chickens. I keep a bottle of FishMox nowadays.