One chicken not laying but all the others are

[Bitsyblue]

I have 5 chickens and this is their first winter. I live in central Texas and the days are shorter but not too cold yet. One of the chickens is not laying and I am concerned why. She acts normal, but last night I noticed that she was sleeping in the nesting box and not on the roost with the others. That is the only odd behavior. I have not found any eggs around our small property.
Thank you for any advice.

 

[sourland]

Any possibility that she is going broody?

 

[Bitsyblue]

I am familiar with the term but not sure exactly how it exhibits itself. She doesn't have an egg that she is trying to hatch, just not laying any and sleeping in the nesting box.

 

[BoundlessLove]

This thread helps explain some signs of broodiness.
https://www.backyardchickens.com/threads/broody-signs.1659452/