The Duke and Duchess of Cambridge have three children together, Prince George, seven, Princess Charlotte, five, and Prince Louis, two.
In the past, Kate has spoken out on parenting and her family life.
Being a mother seems to take priority over her royal role, the expert suggested.
Kate may also be focused on taking a more traditional approach to her role in the Royal Family.
Judi continued: “Her roles as wife and mother seem dominant, unlike some of the royal women who excel in other careers.
“I’d imagine her focusing on the very traditional path of charity work but without any of the staunch campaigning or ground-breaking and often controversial paths taken before her.
“The royals have been in one crisis or another for two generations now and Kate should be the ideal influencer for calm and stability again.”
If Kate gets the title of Queen Consort, she will have the same social rank and status and the monarch.
“Her styling and her body language are impeccable and – in a world where royals, like celebrities, are chopped down to size on a regular basis – she appears able to avoid anything other than petty criticism.
“We see very little if any displays of emotions other than positive ones from her in public.
“With their touch rituals at a minimum, we are shown little if any glimpses into her relationship with William other than the happy, positive and loving traits.”