Let's try and learn something from this. First, it's a good idea to try to keep both hands on the wheel in a crash, if for no other reason than to prevent them from poking out the side window. Second, keep the interior of your car clean. The woman is lucky none of the stuff in her back seat flew to the front and injured her. Finally, drive very carefully on wet roads, especially if you live in a dry area that doesn't see much rain; the first rain of the season can make oil-covered roads very slick.
Check out the video below to see the barrel roll and how calmly the woman handles it.