Many people jump to conclusions of vent gleet whenever feathers are dirty around the vent. It is a sign of runny droppings which can be caused by many things. If the bird has not been wormed, I'd worm her. Then run vitamin-electrolyte-probiotic dispersible powder in the waterers for 3 days. It is always a good idea to worm again in 10 days after the first worming. Check for mites/lice and treat if necessary. Let us know how things work out.My Ameraucana has had a dirty bum for about a week. I haven't had her and the other flock members very long, only a couple weeks, but I dont recall her having a dirty bum when I got her. Also, she was tagged on her leg twice it looks like, does anyone know why that could be? Thanks guys!
People usually use identification bands on legs in order to differentiate birds by age, etc.