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 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.