Lillibet
royal
Royal
Protocol dictates any member of the Royal Family or staff refers to Her Majesty as etither "the Queen", "Her Majesty" or both "Her Majesty the Queen"
gramma
The princesses in the Spanish royal family are call Infantas
QueenYour MajestyHer HighnessYour Royal HighnessMa'am
When Elizabeth II was a small girl, Queen Elizabeth the Queen Mother called her 'Lillibet'.
Wombat
The princess is any female relative of the king or queen; for example princess Margaret was Queen Elizabeth's sister.
To properly greet a royal, there is no formal protocol. There is a traditional method when greeting members of the royal family, which is, for men, they would bow their head, and for women, they would curtsy. To address the Queen, one would say, "Your Majesty" and then one would continue to call her, "Ma'am".
No one can make a royal family royal most of the time they are just living a good life because of what their ancestors have done and sometimes they really are hardworking and kind so people call them the royal family even if technically they are not royal. In the British Royal Family, their ancestors such as Queen Elizabeth I did such heroic deeds (throwing a king off their thrown or taking over a kingdom) that they become king their selves and their lazy descendants live off of that not working hard. It might seem a bit offensive but really it is true with most Royal Famillies, I'm not just pointing a finger at them because I am pretty fond of them myself.
She is a Princess.