Broodiness or something else?

[Wymferg]

My 17 wk old Aracaunas/Buff Orpington hybrid pullet wouldn't come out of the coop for the past two days. She just either sits on the floor of the coop or perched up on the roosting bar. She's eating very little, looks alert, normal poop. Can someone give me an insight on her?

 

[Ol Grey Mare]

So she's a pretty young bird - has she started laying yet?