She did the challenging stuff she cares about. One aspect of nerd brain often is that you can hyperfocus on challenging stuff, but can't get the motivation to work on stuff you don't care about - and even what would be a 20 minute task can end up taking days because of that. It's great that she has the self awareness to set goals, and step away once they're done.
I didn't have that in that age - and still sometimes struggle. I was lucky enough that my employer back then recognized my issues, and paired other people with me for doing the stuff I was not interested in, and now usually manage to load those issues onto other co-workers by myself.
I've said it before and I will keep saying it again: the financialization of everything and the utter dominance of braindead, long-since disproven MBA ideology is going to seriously impede our societies in the next decades.
And now that tech is flooded with people, it's gonna be easy to just not deal with the troublesome "weird" people, and instead go with those who are happy to go thru all the bureaucracy and 10 stage interviews
I wouldn't be so quick to judge someone for ADHD.
Because I have it, untreated. And I couldn't even finish university because of it. I'm unable to do certain things, like at all, I'm nearly physically ill when doing these things. Hard to explain it, to someone without these problems :)
Luckily enough, it's not that important here / Idc about money, career etc.
I have ADHD-PI or whatever (diagnosed). I know the struggle. it's a life long battle that never ends.
Hang in there
(Mind you, I'm not talking about a matter of inborn temperament or character, much less a moral flaw! Rather, finding the compelling challenge even in "boring" tasks is a valuable skill and situational tactic that anyone should explicitly learn about and aim to acquire as part of becoming a mature professional, not a matter of morality or somehow being dismissed as "lazy"!)