另外关于公主的说法是这么解释的
Under the current practice, princesses of the blood royal are the legitimate daughters and the legitimate male line granddaughters of a British Sovereign. They are dynasts, that is potential successors to the throne. For these individuals, the title "Princess of the United Kingdom of Great Britain and Northern Ireland" and the style "Her Royal Highness" is an entitlement for life.
英文不是太好,大致翻一下
按照现行的惯例,皇室血统的公主指不列颠君主的合法婚生女儿,以及合法婚生儿子的(合法婚生)女儿,即孙女。对她们来说,她们是王朝统治者的王位继承者,"Princess of the United Kingdom of Great Britain and Northern Ireland"和 the style "Her Royal Highness" 是终身享有的
所以比公主和尤公主绝对享有"Her Royal Highness"敬称。