I raised 12 chicks this spring for my new farming experience. I noticed that one just seemed to stop growing but was a active as all the rest, then the other day she would just come out and stand in the same place for hours. She closes her eyes alot and has this side to side jerky movement with her head. I picked her up the other day and she vomited. Last night I had to put her on the rooste. Any suggestions as to what the problem could be and what can I do to help out my little girl.