This has been going on for two days now. All 7 other hens are fine except what I've observed from one of my light Brahmas. They are 10 weeks old now. She just stands or sits there constantly contracting her body. Didn't think this looked normal which is why I'm posting here. Nothing out of the ordinary on her physical exam either. And she's drinking and eating from what I can tell. Her vent looks fine. Only past medical difficulties I've had with my two light Brahmas are pecking at there tail feathers but some blue kote fixed that. Thought I could rule out egg bound due to there young age. And sort of ruled out constipation because I've seen her pass normal stools recently. This is my first time raising chickens so I'm not sure if I'm over reacting or if something is actually wrong. Any information is welcome and thank you.