Placing pine shavings on herself

[Yay Chicks!]

One of my hens, a BR, is out sitting in the nest box, and while waiting to lay her egg, she is delicately picking up pieces of pine shavings and placing them, one by one, on her back. What the heck?

 

[ceeceeholt]

She's doing that to help her make a nest! She puts them on her back and shakes tehm around her:0