I watched that boxing in vid and didn't see anything. Just a wide road and no position changes. Perhaps the video changed for the indicated time marks.
When she was around 14, I saw Vos in the Harderwijk cross. Girls started a few minutes after the boys. Who were WC podium boys, her age. She hauled them in, all but the first few. Around that age she started winning national MTB races.
At 16, she was so tough on the MTB that a National top-10 elite man could not drop her on a 2 hour bike tour. These Dutch and Belgian MTB tours are basically races against whomever you find on the trail, or start with. I've dug deeper in these than sanctioned races. Anyway, her talent is off the scales.
At the same time, she comes from a tight cycling family. Always guarded by parents and (cycling) brother. Creepy, in my book. Sports families where all revolves around the kid's sport creep me out. Young doping positives come from such families. Immense pressure on the kid (win for parental love), even if parents aren't administering the first needles.
From the places I've run into Vos, she's a true fan of sports. Shows up to MTB races she does not enter in, finding a way to get there during a road training. Has never seemed any less than a genuine friendly and modest person. That is kind of rare at her level of excellence.
So many mixed hints. The fanatic and protective family, the insane talent (which could have sparked the former), the dominance, the overwhelming kind demeanor... It could go either way.
She really makes the great male cyclists of all time seem like awkward ducklings in terms of results, while in personality off the bike, she totally IS that duckling.
Another thing. I seem to remember her teen acne being severe. Not great for any girl to cope with. How common is this among healthy endurance sports teens? Is there is difference with non-sporty teens? I've ridden with only few guys who suffered from acne, but been to school with more, it seems. Anyone know more? We all know what acne in successful sports women CAN come from... I've seen it on Dutch sportswomen in all the wrong points of their careers.