Interesting ...
Well, if this is true and a queen can sometimes be elected, then it proves that Leia is not a princess due to her relationship to Amidala - since 1. Amidala was not a true queen, but more an elected official. And 2. Amidala had renounced the title of queen and passed it on to someone else long before Luke and Leia were born.
So, the Organa connection must be where the "princess" title came from all along.
I'm good with this.