“Although this might just be a sign of the added pressure she’s now under in terms of working flat out to prop up the Royal Family’s image in the face of scandals and dramas, it might also hint at some inner sadness she might be feeling at Harry’s departure.
“It could be that Kate is quietly mourning the loss of her younger brother.”
As well as feeling sadness for herself, Judi explained Kate could be worried about how other royals are taking the news.
In particular, the Duchess of Cambridge could be showing sympathy for Prince William as he has reportedly been going through a rough patch in his relationship with his brother.
source: express.co.uk