In Monaco she is accorded the title and style of HRH The Princess of Hanover SAR la Princesse de Hanovre That is the valid title Even in Germany a republic she is accorded the style of HRH and the title of Princess of Hanover only because it is recognized in Monaco The difference is that HRH s husband may not be so recognized There are plenty of other articles that utilize defunct titles and styles however those stay For instance check out the Luxembourgish Grand Ducal Family They all use HRH when that HRH of Parma isn t valid anymore and may not have been in the first place Nonetheless the sovereign of Luxembourg recognizes it as do foreign governments The same holds true for Caroline Her father and now her brother recognize her as HRH The Princess of Hanover If you insist edit every single article on German royals after 1918 I can guarantee that your ideology will have you blocked That s not a threat from me that s just careful guesswork