I wish I had learned to separate eggs prior to this so I have no idea, I had so many babies I couldn't decide. I've looked over her for leakage and she doesn't have any colors coming through.
Do you have any early pictures of this bird in fuzz? In most White Sport CL there is enough leakage in the fuzz stage to make out the ghosting of the chipmunk pattern, that leakage fully disappears with feather growth...