I hope it’s resourcefulness, but it’s hard to imagine a 14 year old making it on her own for such a long time. But who knows, maybe she was doing bug bounties or freelance work and having the payment go through a corporation to get around the age thing. For like $500/year you can incorporate in some places it might even be less.
You don't even need to go that far. You can make good money with a push mower just mowing a couple lawns each day and (up there) I think you can then snow blow in the winter.
It is entirely possible to fly under the radar and make enough money to live ok.
If you're the least bit handy there's all sorts of cash only work that a 14-18 year old doing wouldn't raise any eyebrows, especially if she's been staying near small towns a cash only rent deal for some trailer or shack is also not going to be hard to find.
There are so many traveling kids out there. The types who sell wrapped stones and hemp bags at street festivals, drifting in and out of communal living situations, camps, etc.
I flirted with all that when I was younger, still think about just taking off in my car sometimes. Ok, a lot of the time. It’s pretty tempting for a lot of us to just say fuck it, and drop out of society and into a counter culture, or a nice intentional community.
Hell, I had fairly supportive parents, and I barely held on. But in some sense, I really just prolonged things. Dwelling on the same thing for decades, through changing perspectives.