You're missing the point. I'm not mad about her acting like an adult, she's mentally an adult, so she can do whatever she wants.
It's her misconception about the law and that being accepted which is making me mad, also bad parenting and shit like that. She said her parents can't take decisions in her stead... like what? OFC THEY CAN. THEY ARE THE ONLY ONES WHO CAN, KID. Aren't you an adult? why would you say that?
And physically, she's not a teen. She's a CHILD. she's like 3-7. I don't even care tbh. as long as she's under 15, her parents have full custody and authority over her. They can and should make decisions for her as she's a minor and can't give consent. That doesn't mean her opinion shouldn't be considered though. She can give her opinion and the PARENTS should consider it and then come to a conclusion. That's how parenting should be. In the first place, selling your kids' pictures like that is... yeah, like, excuse me, mam??? And then leaving them to deal with the mess... wtf? No matter how mature she is, leaving a 3-7 yo to make decisions for herself... not correcting her when she spoke of the wrong law? lol, ok. The parents are... I feel bad for her tbh. RIP 
Also, who said anything about child labor or being a war veteran? Even if we were to talk about that, do you think child labor exist because the kids want to? no, it's the parents who force them to do it. or they have no choice. Same goes for going to war. Most kids would stay the fuck away from it. In any time period, no 3-7 yo would make huge decisions for themselves, they'd have parents or nannies or their guardians or whatever to do that for them. Except for orphans or homeless kids, sadly.
And yeah, it's just as you said, her parents are idiots. That makes me mad as well. She's got bad luck. But at least, since she can, i think she should speak to her parents about this as well so that they can correct themselves. BRUH.