I kinda like her hair here at the Met. Very Scarlet O'Hara style and she even has the same death stare. Anyways Kate does look tense or upset in that gif. Like she had a fight or something previously... Maybe with William? That she looked sort of tense during the event and did not take PW's hand when arriving tells me something.
I thought of Scarlet O'Hara too. It's not really appropriate somehow, though I couldn't immediately say why exactly. Well, maybe that's not an ideal person for her to draw comparison too, all things considering.
Also, she ain't no Vivian Leigh. Look at Kate's photo, above, then look at Vivian's. Come to think of it, Kate ain't no Scarlet O'Hara. To me, Scarlet is naff. But she's lively.
If you read the book, you can see that in many ways Kate is Scarlett O'Hara. Scarlett was very calculating when she went after her husbands. She learned her lesson in the end, but it took her a while to get there.
Kate is NOT Scarlett which ever version of GWTW you happen upon. Even where husbands are concerned.
Ignoring all Scarlet's other qualities that Kate doesn't possess and looking at her husbands, first husband was a nonentity she would have been bored with if he hadn't died. He was a mistake she made in a thoughtless fit of pique to make someone else (Ashley) jealous.
She was more calculating with hubby no 2, but again it was an opportune moment that presented itself at her moment of need having been disappointed by someone else. second hubby was completely under her thumb, a submissive who was very afraid of Scarlett and did everything she asked him to do whether he agreed with it or not.
Husband no 3 was her equal, but she never realised this until too late. HE talked HER into the marriage. She remained indifferent to him and his needs except for his money until too late.
And throughout all this she flouted societal conventions and if not for her cousin Melanie who protected and defended her at every turn, Scarlett would have been a pariah.
Kate doesn't have a tenth of the character, calculation, beauty, obstinacy of Scarlett. Kate needs her mother Carole to help her stay the course. We haven't seen Kate's character yet because she she's never been tested. Nor is she as self destructively spoilt whilst simultaneously being as resourceful as Scarlett.