Queen Elizabeth II 's impressive, 70-year career saw her achieve a smorgasbord of achievements as Britain's monarch . But according to one royal biographer , the late Queen struggled in one particular area for an understandable reason. In the book My Mother and I , royal expert Ingrid Seward discussed Queen Elizabeth's approach to " emotional confrontation ," revealing why the monarch found it difficult to deal with. Referencing Princess Diana 's alleged penchant for crying nonstop in Queen Elizabeth's presence, Seward wrote, "She would wait in the page's vestibule next to The Queen's sitting room and as soon as any visitor had departed, she would push her way in and throw herself on The Queen's mercy, frequently sobbing and telling her mother-in-law how much Charles hated her." Article continues below Seward continued, "Not surprisingly, The Queen had no idea what to do.…