As long as she made her annual sacrifice and could take away her children's will by sacrificing them, she would be eternal, young, and beautiful.
The daughter of Winter, Snows White, who unlike the others had been sacrificed, taken their lives, drunk and bathed in her blood, eaten her flesh, given her soul to the mirror demon.
At that time, she let her favorite live, but she grew, envy and madness like the others took her, envied, she killed her, but unlike the others, she wandered like a zombie, in which she was accompanied by spirits of annual sacrifices of other maidens through the underground corridors.
That girl wasn't just used as a sacrifice, dead wandering the underground until she was sent as one of his dead soldiers who roamed the icy borders, killing men or luring them to the queen.