I'm tired of drawing. Since I've already redesign Twilight's unicorn, I should also redesign her alicorn. In short, if the Princess uses dark magic, then her student doesn't shy away from it either. That's why she looks like that. She also doesn't look like a beta alicorn, but that's because dark magic is stronger (Celestia wouldn't have been able to handle it without the Elements of Harmony)
And, like Cadance, her alicornization occurred without the involvement of another alicorn














