A suggestion is she may have an underlying medical condition that the hens are sensing. If you can solve that condition sometimes things can be right again.
Take a look at your space , if it’s too small this can happen.
Also 16 weeks is very close to coming into lay, and hormones are fluctuating.
Take a look at your space , if it’s too small this can happen.
Also 16 weeks is very close to coming into lay, and hormones are fluctuating.