One of my Buff Orp hens (3 yr old) has suddenly (within the last 3 days) developed a huge mass above her vent. I have given her calcium tablet and epsom soak. I also tried to help clear the vent out (as it seems to be "plugged" with whitish/yellowish gunk). Now, her vent is bleeding. She has been acting normally up to this point, but her poop has been like egg yolk/whites for 2 days and her bum became VERY dirty. I'm not sure what to do at this point.