Hen is very lethargic

[LeastinID]

Sunny is a 2 year-old EE.
She seemed fine when I opened the doors this morning.
I observed that she was just standing in one place for much of the morning and she's just been very lethargic and slow moving.
She joined the other chickens pecking away at treat-time.
No visible injuries.

What should we be looking for?

 

[WaterfowlsPoultry]

Feel her crop, it might have something to do with it, when my hen had something in her crop she would stand still, uninjured but standing still.

 

[dawg53]

Inspect her for lice/mites especially around the vent area. When was the last time you wormed her, and your other birds?