Is the color off on my monitor or is your bird white-skinned? She should have yellow legs (SS would have white). That may have been the reason for the chick confusion because other than the skin color, those chipmunk chicks tend to look a lot alike. If her earlobes redden, I'd say hatchery-quality Welsummer. If they go white, HQ brown Leghorn.
ETA: And she's definitely a she -- the coloration gives her away. Pullets and cockerels both raise neck feathers and feet at each other when working out their pecking order.