When I was 14, more than half a century ago, I got into trouble for holding opinions that the people her would consider merely progressive. One of my daughters in high school got into insulting her peer group by using a vocabulary they didnt understand. They thought she was praising them. She is now in her thirties and very well adjusted. If she had done such a thing in middle school, I would have been very amused, but her mother would have been absolutely mortified. Probably best that she didnt.
It depends. There is a range of approaches. The classic approach, of which I think you are speaking, is indeed very short term. Girls are paid per day/shoot/scene and that's all. Other girls own and operate their own websites, retaining copyrights, and can generate a stream of income over a great many years. There are women out there in their late twenties still releasing "new" material shot while they were 18. Many who opt for this approach don't do sex, or even nudity, and so don't suffer any health repercussions. But that takes planning and a degree of time/money investment.
I wouldn't encourage the career, but I would fault any teacher ready to dismiss the industry. If you ask kids what they want to do, you shouldn't be critical of answers that conflict with your personal morality.
Someone who ignores our system of justice would be expelled. It happens.
It all depends on whether she wants to be in this environment or not. Most people want to be, but not all.
If she lasted long enough to understand that she could be heard by being her real self, then she would probably stay. But it can take a long time to get through the toxic layers some students have built up over the years.
I hope they don't read Lord of the Flies. I'm not sure that I would want a group of teens, especially peers, to judge me on anything. Didn't Trek TOS also cover this in the episode on the planet without adults?
Keep in mind that your experience is with people who are living in a competitive world. If you belong to a cooperative world, no one benefits by putting someone else down. When treated fairly, they treat others fairly.
For those coming from traditional schools, it sometimes requires a few conversations or JC writeups before they start to have empathy, but most get there fairly quickly.
Moreover, she probably gets social encouragement from her classmates for doing things like this. Put her in an environment where the classmates made the rules, and now she's just a clown surrounded by people rolling their eyes.
I condole with her teachers, at the same very time.
One of my friend's daughters is vicious at this. At 14, for a "career and personal planning" project, she stated career her goal as "porn star" and somehow wrangled a skype interview with a 19yo "mentor" in the biz. She has no intention on following this path, but loves how it drives teachers up the wall. "If billy can want to be a soldier and kill people, then I should be allowed to pursue my dream too." She's a perfectly normal girl, but once she identifies an authority figure as weak she turns them into toys. Put her in a free environment and I'd expect resignation letters within the week.