It looks possible that the hen is not sp, but definitely BS. It's likely then that the chick is out of that pen. If it was out of the cameo pen, it would have been cameo, no doubts now. Maybe your opal BS sp hen is only BS pied split opal. Blackshoulder hens have a great deal of white other already, and given that both pied and sp add more white, it's possible there was a mix up. How long have you had these birds? The male looks opal, but I'm only going by the colour of the neck, which is an opal colour when you compare it with the vibrant blue of an Indian blue BS sp.