I don't think it was the fact that is was a silkie that it happened... I have found two of my cornish crosses flattened like that, too, when they had plenty of room and lots of heat. It can happen to any chick. If they're doing poorly, or are weak, they tend to find themselves at the bottom of the pile, and the other chicks are oblivious to the fact that they're flattening one of their siblings. Don't beat yourself up too bad (too late?) - it happens to the best of us. :aww