Being married to a Brit, I've met lots of European kids. Overall, I find them to be much more mature than American kids. I find American parents, in general, (yes, I know, a broad generalization) coddle and shelter their kids too much. Indeed, I find that my fellow Americans are, in general, blissfully but ignorantly unaware of how the rest of the world lives and operates. Seeing the world really helps you understand how good we have it.
My son is 9, and I want what's best for him. I want him to grow old having lived a happy and fulfilled life. Whatever he does, I'll try to teach him what I know, and help him as much as I can to make good choices, but I won't make his choices for him. If he joins the military and goes into combat, I'll be worried sick, but I'll be proud of him. If he chooses to circumnavigate the globe in a kayak, I'll be worried sick, but I'll support him. Hopefully, I'll have done my job as a parent and taught him and helped him learn from other more knowledgeable sources than I what he needs to know to accomplish his dreams.
The son of a retired local judge here, when he was about 25, went to Europe for a summer on a backpacking trip. He was killed in a run-of-the-mill car accident. Very sad. But he was doing something he loved and was seeing the world like most of us never will. Another friend of mine's daughter died while working in India doing charity work. Sad again, but wow! What an adventure she had.
Having done a bunch of bareboat charter vacations, I envy this girl her coming adventures. It looks like she's done her homework, so to speak. I don't think it's madness at all. More power to her, and I wish her well.