Dinner at Fifty Below Zero

When an apocalyptic freeze hit, she used her magical pocket dimension to keep her ungrateful family alive. In return, her husband stole her jade pendant for his lover and threw her out into the blizzard. Reborn before the disaster, she instantly divorces him, liquidates her assets, and builds an impenetrable thermal fortress. As the eternal winter descends once more, who will be begging for mercy when the frost takes over?