One of my 4 mo. old hens is acting strangely. Fine earlier but when I went to usher them into coop she didn't come. Was just standing in the yard. When I went to shoo her she didn't even move. Finally she walked slowly into the coop and now is just standing in the corner. Not eating or moving. She walked upright just fine but just slow like she is frozen. It was cool today so I don't think it is heat. I know they are practicing laying. Could she be feeling something happening. The others all seem fine and active. Any thoughts or suggestions of what I should check for. I hope she didn't eat something that is bothering her. Eyes clear and no discharge.