By Emma Mackenzie The Royal Family has been widely reported to use a series of lighthearted nicknames for one another and even the most senior royals can’t escape the jokey monikers. A royal author has claimed that the late Queen Elizabeth had a particularly savage nickname for Kate when she first married Prince William in 2011, and she officially joined the House of Windsor. The nickname has been widely reported for a number of years, and is claimed to have its origins in the late Queen’s opinion of Kate’s career – or lack thereof – before she became a working royal, and her work ethic overal…