One hen won’t lay eggs

Hi all,

I got a group of chicks in the spring of last year (4 girls, 1 rooster) and by the end of the summer they were all laying eggs (at differing intervals and frequencies due to all different breeds).

One of my hens stopped laying in the fall and has not laid another egg since. I also noticed my rooster completely stopped mounting her. I’ve checked her for mites, worms, and have increased protein and calcium intake through various forms of snacks, supplements and dietary changes. She has shown no signs of distress or lack of interest in eating or foraging.

They free range which made me suspicious she was laying somewhere else so I’ve conducted some experiments and left them in their coop/run for a few days… still nothing.

What am I missing?