One more thing I thought of related to this, though admittedly unlikely relevant to the girl described in the OP, is how the rationale to take initiative can change over the course of a career:
I am currently over a decade into my current career. (I did a career change in my late 20s, making my current career career #2.) In my first 1-2 years I was a sponge, absorbing everything I could find, eager to learn the ropes, develop a natural feel for the work, and get over my imposter syndrome. I worked as much as I could, and took on extracurricular learning and other related projects outside of working hours as well. I was awarded a raise after the first year (which I think also reflected the fact that the first year was sorta probational and after that it was "Yeah, you're legit").
In the 2-3 years that followed (so, years 3-5 of my career) I was equally ambitious, staying up to date on conversations in my field, thinking and writing a lot in my spare time about problems in my industry, and even publishing a paper in a prestigious venue, which was a year-long effort in its own right. I also gave presentations at conferences, created a website, and took steps to become sort of a thought leader. Once again it paid off, as I kept getting hired by new companies, each time at a much higher rate than the one before. (A robust job market helped me along, to be sure.)
Then I reached a point in my career where I realized I was comfortable. I discovered that I could do my job to my employers' satisfaction in just a few hours per week, and the rest of the time I was able to put to my own use. I upped my workouts from 3 days a week to 6 days a week starting the end of 2021, and that's also about the time my wife and I started getting into
permaculture. I started doing more woodworking and other DIY stuff too. And I was able to spend a ton of time with my family and be there while my kids grow up. Why shouldn't I? My employer was happy, my
retirement and my kids' college tuitions were saved for, my bills were paid. On top of that, the thought leaders in my industry had begun talking about the same things I'd been talking about for years already, only they were appearing on TEDx and Joe Rogan and Netflix documentaries--a much broader reach than I'd ever really aspired to.
The economy turned south last fall and I got laid off, and after a few months and scores and scores of unsuccessful job applications, my outlook has been affirmed rather than shaken. Initiative in your worklife is a crucial thing to be able to take when you need to. In about my third month of unemployment, I discovered a deep well of initiative still within me, and now in my ninth month I'm glad to see that well is not even close to drained, and I feel like it's moving me closer to a job. (I've taken this time off to gain skills and knowledge and perspective.) But I don't regret the years when I was comfortable. I enjoyed that time, and it's time I won't get back so I'm glad I spent it as I did. I'm healthier and more fulfilled for it.
Granted, I also didn't complain, ever. But knowing when you have a right to complain and when you don't is also a skill you learn over a lifetime, and many people never learn it.