She was spotted arriving at St Mary’s Hospital’s private maternity unit where Prince Louis was born to help the duchess get ready for her public appearance that day.
Ms Archer first began working for the royal household in 2007.
She is married to Getty’s royal photographer Chris Jackson who took the official pictures to mark the Prince of Wales’s 70th birthday.
The couple have recently celebrated the birth of their first child.
The Royal Victorian Order awards are in the Queen’s gift and are bestowed independently of Downing Street to people who have served the monarch or the royal family in a personal way.