It is a blackshoulder hen but to me it look like it has spalding low percentage in it so that make it a spalding BS hen that why so much color in the neck. The white male is not the father of it. You said they came from a bird rescue so it had to be breed before it got there by another male. If the white male would have been the daddy she would have white flight feather. Anytime you breed a white to a color bird all chicks will show white flights.