Following the passing of Queen Elizabeth II, the dynamics of seniority within the Royal Family underwent a transformation, prompting adjustments in the behaviors of certain royals in their interactions with family members.
This protocol meant that she had to curtsy to Princess Anne, Princess Beatrice, and Princess Eugenie, all born into royalty. However, the dynamics have shifted, and now these Princesses are expected to curtsy to Camilla, recognizing her elevated rank. Consequently, Princess Anne must set aside her 'blood Princess' title when greeting Camilla.
In practical terms, this implies that Catherine, the Princess of Wales, Meghan, the Duchess of Cambridge, and Sophie, the Duchess of Edinburgh, are still required to curtsy to the Princesses born into royalty if their husbands are not present.
Thus, Catherine is obliged to curtsy to Queen Camilla, and in the absence of William, she must extend the same courtesy to her cousins-in-law Beatrice and Eugenie, along with her aunt-in-law, the Princess Royal.
Photographs captured Princess of Wales engaging in a curtsy to the Queen and King during the coronation concert, although such moments typically occur off-camera as the royals exchange greetings before stepping into the public eye.
Princess Charlotte has also mastered the art of curtsying, evidenced at the Coronation Concert where she offered a curtsy to her grandfather, the King, and Queen Camilla as they passed her on their way to their seats. While the royals discourage curtsying to children, even 'blood Princesses,' Charlotte may not witness similar gestures from other royals for some time.