Chicken roosting away from others

[Gwhite3678]

Hi there,
I have 9 pullets about 24 weeks old along with 1 rooster same age. They have all been together since they were chicks.
I noticed within the past couple weeks one of the girls is roosting away from the others. They are all somewhat spread out but she is way off by herself.
She does not seem ill and I have not seen her be picked on.
Is this something I should be concerned about?
I am wondering if it will become an issue on cold winter nights

 

[sourland]

Unless she is being picked on, she will roost closer if she gets cold.