Mother's Doomsday Revenge

Mother-in-law burned by three sons for inheritance during earthquake fire. Only sister Clara saved her. Reborn before disaster, she cuts ties with sons, withdraws savings, returns with Clara to ancestral home. As extreme weather arrives, she uses memories to hoard supplies. As social order collapses, she watches sons and greedy villagers kill each other. In the apocalypse, she adopts two orphans and achieves a peaceful old age.