I agree in your disagreement. I think she should do it, just know what she is getting into.
Hehe. At such an age, there is no way she can even imagine what she's getting into. Doesn't matter how much she reads about life here. It's why we as a species manage to move forward in so many different ways - the courage to do stupid things, that can sometimes turn out to be the best thing we've ever done.
Canela, most of us have been knocked around quite a bit by life in one way or another. What we on the forum know is how we would have done things different in our own life, not how you should do things in your life.
I have two sisters-in-law who live with us, who come from a very, very poor background. We're talking thatched roof, dirt floor, walk to school with shoes falling off your feet poor. They got a growing-up early in such an environment and they understand instinctually what DirtBoy means when he gives his advice. They are much more serious about life and seizing opportunities than any of their schoolmates are because they know what it means to have no opportunities and to suddenly be given what seems like the keys to the universe, even though to people in the States it isn't even as much as many there get (no being cheerleaders [one of them REALLY wanted to go to high school in the States just to be a part of such a fable], no car for the 16th birthday, that kind of stuff).
If you need to experience poverty and hardship at a young age in order to get what you are looking for out of life, I say go for it. Of course, you have a safety line in your folks, I'd imagine, to pull you out if things got ugly. Not really the same, but simulations can be helpful.
I've always maintained that it should be a requirement that US youths get out of the country and see what the world is really about. Just make sure you can get back if things get funky.
And I hope you draw the correct conclusions from what you learn here.