With Prince William being second in line to the throne, Kate Middleton will inevitably be queen consort someday. Some experts believe she is already preparing for the role, as they believe Prince Charles, the heir, may hand the crown straight to William (via Marie Claire). In recent years, Middleton has been taking on more responsibilities, from becoming a patron to more organizations than before (some being the queen's herself), her research on the early years of childhood, and the fact that she's been doing jobs without William. Even the way she dresses suggests her knowledge of her future role.
But Middleton, with the larger workload, has said she's suffered from "mum guilt." On the podcast Happy Mum, Happy Baby, Middleton opened up about how she manages work and family as a mother. "I was having doubts and questions about the guilty element of being away for work and things like that," she said (via The Sun).
Kate Middleton's life is drastically different since marrying Prince William with new work and her three children, who are now heirs to the throne, but fortunately Middleton likely has a ton of support.