This 16 year-old Australian girl completed her solo circumnavigation in May.
http://latimesblogs.latimes.com/outp...05/global.html
Probably the most famous circumnavigation by a teenager was Robin Graham in Dove, chronicled in National Geographic through different issues in the 1960's. He was just 16 when he set out. It was mesmerizing reading at the time.
http://www.bluemoment.com/dove.html
I hope the young lady in question is fine but this has been done before. That doesn't mean it SHOULD be done. It seems pretty reckless for the age.
Cowperson