Why are most of the Mario women improperly titled?

-Peach is called a princess despite being a queen -Daisy is called a princess despite being an empress -Rosalina is called a princess despite not being any kind of royalty -Wendy o' Koopa is the only mainline girl to actually be a princess but is not referred to as such

Why is Pauline the only girl given the proper title for her work? Genuine question btw if there is an answer I would like it 😭