2 days ago I noticed that Midnight, our 9 month old black sex-link pullet was not coming over for treats. I picked her and realized she was quite thin (unlike my other 4 fat chickens). She also seemed to be quite lethargic, staring into space, not pecking and scratching. Yesterday I brought her into the house and tried to get her to eat a warm mash made of yogurt, soft boiled egg and layer pellets. She ate a little,drank water if I held it up for her and then let out a series of explosive black stools that really shot out of the pen she was in. I brought some to the vet for a fecal (worms?). She was in the coop over night and that same explosive black poop covered quite a bit of the coop this morning. Fecal came back negative. She looks a little better today, but is still not her perky self. What is wrong with Midnight? How can I help her?