I bought 4 brown egg layers about 6 weeks ago at Rural King. One passed away a couple weeks ago after my dog got it. When I was on vacation, my chicks were at my friends and one jumped out and hit the floor hard and died. Now I'm left with two, fast growing chicks but one has an uncontrollable shaking problem. It seems to only happen when she feels scared and when I pick her up. She is otherwise healthy and growing great feathers, along with her sister. Could it be possible that this is from the traumatic loss of her sisters? Or should I be more concerned?