She is probably thinking that the socks add a nice retro touch that works with the sweater & skirt combo. That the line of the socks actually works beautifully to balance the proportions of the look. And that while she clearly loves style and fashion, she doesn’t take it all & herself too seriously.
The socks are what saves this from being absurdly cutsey. Otherwise it would look like an office worker that wished she was still fifteen. I wouldn’t wear yellow heels with bows with the frilly skirt myself, but with that hair and socks she pulls it off.