From that article, "Manko has frostbite on her legs and feet and suffered from hypothermia, but her family said she survived because of her mental toughness and by thinking of hope and happiness."

It sounds like her mind and mental toughness saved her life. I've been reading "SAS Surival Handbook" by John Wiseman. He says that lack of mental toughness is what does most people in (paraphrase).