How did Bessie die in when the legends die

During the harsh winter, Tom and Bessie take a fruitless journey to the lower valley in search of food. As they return to the lodge, Bessie becomes increasingly weak and can barely walk. Recognizing that she will likely die shortly, Tom attempts to gather food for her and comforts her with chants and songs. After reminiscing about their lives together, Bessie dies and Tom buries her next to his father. Singing and mourning her death, Tom returns alone to the lodge.

Ok uhh exactly why is the question here