Droopy neck, 14 week old bielefelder

[PNW keeper]

I have a 14 week old bielefelder and suddenly she is exhibiting droppy neck like she can barely pick her head up. No obvious injuries.

Any idea of what it could be?

I’ve separated her from the rest of the flock.

See video,

 

[AidKD]

https://www.backyardchickens.com/articles/wry-neck-causes-treatment-and-prevention.67732/