Kate Middleton knew that her life would change when she married Prince William. However, she had no idea of the scale because it was impossible to prepare for it. The Queen approved of her grandson’s marriage to Middleton because of her character (via People).
It’s not difficult to see the resemblance in demeanor between the two women. The photo above shows how they cut similar poses when they attend public events and maintain calm dignity. This makes it easy to understand why Queen Elizabeth liked Kate and had a good relationship with the younger woman.