Sandra is barely breathing (please see video). She is a two year old Ameraucana, lays one egg every day, even until yesterday. I cleaned the coop a couple months ago and added DE around the perimeters per usual. I added apple cider vinegar to their water (I have 4 chickens) this morning. All other chicks are okay and laying. Have had all since days old. Please help - what do I do!?!