I am not so sure. In any case an actress, and she was the only American in the cast, would be surrounded by camera and lighting crew, and all sorts of catering and security staff, the vast majority of whom won't be huggers.
I actually have a SiL who has a mother from Latin America and a father who was a diplomat, and who is prone to big stage like hugs. She sort of lunges towards you and bangs each of her cheeks against yours whilst making a loud smacking noise with her lips straight into your ears, without regard to the other persons body language. I am sure she knows that it is not general practice and may well make people uncomfortable. (She went to a very posh English convent boarding school and then onto finishing school, and then, with my brother, hung out with the sort of posh/rich people who have country house weekend parties.) The point she seems to be making is that she is in charge. We were holding a large birthday party and I did a straw poll of friends, all of whom, it seems, hate being pounced upon and hugged by people they don't know, so I asked my brother if he could ask her to tone it down, which thankfully she did.
(The very bizarre thing is that after the hug she will ignore you, at least she ignores me as I am several rungs below her socially. So I once went to her house to pick up my mother, was hugged and invited to sit down and wait, whereupon she went on to make herself a cup of coffee without offering me one. Really discombobulating.)
Meghan is both socially confident and an actress. Kate, for cultural and other reasons, is reserved. I am surprised that Meghan did not learn more about different body languages when taking acting classes, or when observing people in advance of a role. I am also not too sure that Canadians, where she lived for several years, are that demonstrative. (Never been hugged by a Canadian!)
My point is that if you are going to invade someone's personal space, even with a friendly gesture, you are the one taking the action so need to be conscious of how it might be received. And if you got it wrong, perhaps not complain afterwards.