How does Victor's mother die?

When he is seventeen, Victor's family decides to send him to the university of Ingolstadt, so that he might become worldlier. Shortly before his departure, Elizabeth falls ill with scarlet fever. Caroline, driven almost mad by worry, tends to her constantly, with complete disregard for the risk of contagion. Though Elizabeth recovers thanks to her extraordinary care, Caroline herself contracts the fever. On her deathbed, she joins Elizabeth and Victor's hands and says that her happiness is dependent upon their eventual marriage. With that, she dies.