My 24 week old Brahma, Figg (not yet laying) has always been much skinnier than her sisters and always seemed mentally slower than the other chickens. The free ranging flock will scurry in one direction and Figg takes 30 seconds to figure out where everyone went. I've never really thought much about it until two days ago when she couldn't stand up. I picked her up and she went limp in my arms. I checked for injuries and examined her vent, nothing seemed out of the ordinary. She had no energy to protest during the examine. She's been eating and drinking, I've since added vitamins, electrolytes, and a dewormer to her water and separated her from the rest of the flock. Her droppings are normal, and her energy level has improved but her legs are still very weak. They shake when she's standing for long periods of time and she seems off balance. She's most comfortable sitting. Does anyone have any clue as to what might be going on or any advise for treatment? She's a sweet girl and I don't want to loose her. Thanks!