Kelly is obviously a ski-bot and has been all over the world, is home-schooled and basically trains a LOT.
Not saying that is bad because that's basically how most every other kid gets good. Gus Kenworthy and Nick Goepper locked down tricks because of drive, repetition and a decent set of stones. And then they tried to get out to the hill every possible chance they could. Kelly has just been raised in an environment where skiing is priority #1. Now that she'll probably win most of these comps sleepwalking it has to be a pretty sweet gig. She can probably trot out the same run comp after comp and just wait for anybody to challenge her. I feel she'll wait a long time.
But locking in air-awareness like that at age 10-12 is obviously working to Kelly's advantage. She just has stuff down. It looks effortless where some of the other girls seem to struggle to get stuff around. Now others are going to have to try and play catch-up and that's a recipe for some tough falls.
Kelly also has a fair bit of support. I've heard the Estonian government has some decent money out there for her and obviously she's got some decent sponsors. You see a bit of that in the UK team, but they have nowhere near the progression rate of this little girl. Their young guns are ok, but not great for the support they get. The U.S.? There is like no support and outside of Maggie there isn't too much bright in the future there.
Side note: Watch the top 3 finishers in Womens Dew Snowboard SSD runs vs. Freeski...complain about women's freeski (it is getting SO much better w/ Tiril, Kelly, etc) and watch that snowboard. The girls that won SNB can actually do some things (doubles, etc), but that contest was beat. 180s? 50/50s?
Side note 2: Everything true about side note 1 flips for half pipe. Women's Freeski halpipe is just painful.