I noticed today that one of my 4 day old chicks was not moving around much. I isolated her and checked for pasty butt. Her vent isn't blocked but she has runny yellow poop just sort of oozing out (sorry, it's as nasty as it sounds) She won't eat or drink on her own, but will take some sugar water from a dropper. She isn't moving around, just sleeps under the light, though she puts up a good fight every time I pick her up. I don't know what else to do. I have too many chicks as it is, so I knew I would have to cull them one day, but I just hate seeing her in distress.