That's no argument. Accidents happen everywhere -- even in low risk activities. The point is that accidents are more likely to occur in some activities -- like long boarding. I'm not arguing that she should or should not be allowed to or discouraged from long boarding, I'm just saying your argument doesn't hold water as a reason that she should be allowed to do whatever she wants. Because if you take the risk factor out of the equation, then she should also be allowed to walk blindfolded in traffic, go bull riding at the rodeo, play Russian Roulette. If, however, you do feel those activities are appropriate, then your argument stands.