Kitty is a professional level dancer in both ballet and modern dance. And dude, I don't know if you've ever seen ballerina thighs but they are seriously thick!
I don't really know much about ballet, but after googling I found a photo of what looks like a professional ballerina, "Juliette McLaughlin" And her thighs are smaller than Kitty's.
Of course, I'm picking on little things, but recently a couple of people wrote that they thought something was wrong with her, And I decided to intervene, because her proportions seem a bit unusual to me too.
In the words of Nyanners:
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I wouldn't mind if Kitty really had small breasts

Because all the girls have very good-sized breasts.
Kitty is on the way in this regard, but I wouldn't say that hers is really small, compared to the

Queen of boobs - Emma

of course, it's almost nothing

But if you compare them to others, they're not that small, google "Small Tits" some of them are really sad

It would be nice for the contrast with the other girls if Kitty had slightly smaller breasts, or even girls in the following seasons with almost flat breasts.
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If you check Kitty's picture yourself, you'll see that legs to height ratio is near that
Most likely, you are right about herleg lengths. Her big legs are most likely noticeable because she stands on her toes and because of her big thighs, which visually lengthens/enlarges them even more.