I received a hen about 2 weeks ago and she looked good at the time now her comb is flopping to the side and not as red as it was. She looks like she might be starting to moult - still eating and drinking and acting normal -I have seen some more yellow poo in the area of them. Legs look good and I haven't seen any bugs on her. could she be stressed about change? I have terramycin but don't want to give her antibiotics if not needed. Any input would be great She is about 3-4 years old