Thank you... no there was not anything in the box that she could have fallen from. She wasn't sick either... perfectly healthy the night before. She was also bigger than the other two so I don't see how they could have smashed her. She is the light colored one in the picture.
My new baby chickens were doing great until this morning. They are 5 weeks old and they have been spending time outside with our California warm days and coming in at night. Sadly this morning I found one of them had died sometime between 11 pm last night and 7 am this morning. It was warm out...