Hi, I added two new hens to my flock of four, there was a little bit of squabbling at first but they have sorted the hierarchy out now. One of my new girls, she’s a light Sussex started laying about a month ago, but stopped two weeks after that and we have had no more eggs from her. The last couple of day she’s been very withdrawn, lethargic and not eating but drinking a lot, she has also has diarrhoea but has very good comb colour. She’s not egg bound and there’s no mites. Any ideas what this could be, I’ve kept chickens for 7 years and I’m clueless?