I realize that there are many photos of Kate where her hair and eyes can look warm. And this is why I said she was a "Toasted Winter" since there is some visible warmth in her. But I feel that again, her skin in particular, she has cool undertones primarily.
Debating between Summer and Winter, I was almost sure she was a deeper soft summer. But her eyes have just enough sparkle in them to put her into the Winter category, in my opinion.