I have a pretty good idea how it got the white feathers.
The father is blue (genetically a black chicken, with the "blue" gene changing the black to a shade of gray.) The chick got the genes for all-black from him, either with or without the blue.
The mother has a white tail, right? (I can't see it in the photo.) If she has a white tail, she has a gene that turns black to white. So she could give that gene to the chick, making it white instead of black or blue.
Considering how big the rooster's comb is, he might have produced a daughter that would show a large comb at an early age. The mother might be some kind of production hybrid, which would give genes for early maturity, which would also cause a large comb at a young age (as compared with some other chickens that mature more slowly).
I think there is a chance of the chick being a female, but there is also a chance of it being a male. You will probably just have to wait longer and see how it develops.