Kate Middletonreturned to the spotlight during Trooping the Colour, but the Princess of Wales is continuing to maintain a low profile as she battles cancer. “There is still nothing in her diary. My understanding is that people are going to have to get used to seeing a lot less of Kate,” a source told an outlet. “The priority for her now is going to be family and the children. The youngest of those kids, Louis, is only 6.” “Like a lot of people who have a brush with mortality, Kate is going to prioritize the things that matter to her from now on. In her case, that means her kids,” they added. K…