If she is heterozygous for dominant white (one copy of the gene), then then about half of the chicks would be Whites carrying Black or Blue and the other half would be Blacks and Blues. If she is homozygous for dominant white (two copies of the gene) then all of the resulting offspring will be Whites carrying either Blue or Black. I don't know if there are actually any dominant white birds in the OEGB world, so hopefully one of the more experienced breeders on this thread will speak up soon.