The other night I went out to put the chickens up, to find my EE hen, Muffy, just standing on the ground. I didn't think too much of it because sometimes another chicken will push one off the perch. I then shined the flash light I was carrying on the perch, as I usually do and then when they see it they will jump on the perch, but she just looked at and appeared to be deciding on where to jump. I was patient and waited on her but then she throws her head back, falls on the ground, and starts twitching it. I've had this happen before when giving a chicken a shot, and that time the bird died within minutes . because when that happened I lost all hope of her making it, I picked her up and shook her mildly and told her to stop (yes I was reasoning with her ) and...she did. my initial thought was a heart attack from the immense stress of deciding whether-or-not to jump . so I put her on a perch with a shelf directly under it (in case she falls )to hopefully relive her stress by putting her in a normal situation, so I watched her for about 10 minutes and she starts again. so I pick her up and take her to a cage in the basement, watch her for a day, and release her back out side, and she's completely normal, and laying a green egg a day. my question is why? will it continue? and should she be seperated? other potential 'clues': -about 30-35 degrees (not bitterly cold) -lasts for about 20 seconds -kept head tilted to one side for about 2 hours after -she is 2 years old, large size(5 pounds-ish), Ameraucana mix(EE) -never any health problems I know that is a long description, but I tried to include every detail , and thank you for taking the time to read!!!!!!!!