I'm not a parent, so I can't answer on whether or not I'd let my child go. I don't know how mature my children will be at sixteen years old. Speaking from the point of a 16 year old (in a month, anyway), she's very brave to be doing this alone. Of course, I've always been mature for my age, and there are a lot of "kids" like me out there who have more book knowledge AND common sense than most 30+ year olds. If it's something she's passionate about and has the skills to safely do so, go for it. I applaud her parents for letting her go.
Adults think kids grow up too fast these days and if you think about it, they're wrong. If I lived just a couple hundred years ago, I would probably be freshly married, or possibly have a child by now. The reason kids & teens stay so immature for so long is because they aren't thrown into life like they used to be. They grow up with parents petting them and babying them far after those years should be over. Without freedom, we can't make mistakes. And mistakes are how we learn, right?
So I applaud the parents & the parents on here who trust their childrens intelligence and let them pursue their dreams at such a young age. If all parents had that state of mind and treated their child like that, there wouldn't be as many problems with self-confidence and kids being scared to learn how to rely on themselves.