Can anyone give me any advice one of my hens who is around 7/8 months old was totally fine up until yesterday she then started acting out of character quiet not mingling and roosting a lot. from what ive seen she is eating and drinking fine. Also when I went to pick her up last night to have a look at her she puffed up at me like in a massive ball, she's never done that before she's usually very submissive. This morning she came out but now she gone back in her coop and is sat in nesting box when I opened the box she stood up and puffed up massive at me almost like she's angry???? She layed a egg yesterday but I'm not sure if she's laid today as there are 3 other hens. Should I be worried?