My four-year old Australorp hasn't laid an egg since molting a few months ago. She was fine this morning but I just found her motionless on the side of the house crouched down by what appears to be a shell-less egg. She is lying very still and not responding to us at all. I've attached a few pictures. I think I'm going to have to have a look and see what's going on around the vent...can anyone tell me what I should be looking for? Thanks so much.