Yes, it is difficult to say. When you see the neck you "could" say GP CC. But when you look the bodyfeathers there is as good as no "B/-" pattern to see!!! Point is there are GP CC with very les "Barred" pattern and there are GP with much black-pigment reserve in the neck.
So, difficult to say with only the photo.
Marco? you know something about her parents, what colour they where?