Let me repeat, she was a little girl when she started.
And I guarantee that more little children will be exposed with the proliferation since legalization. Because there are many adults that are not as careful as yourself.
Age really has nothing to do with it, How much you want to bet the first time she smoked it was with a classmate from school. MJ is a weed that grows wild, it occurs naturally in nature.Some kids go hunting mushrooms at that age to get high. Some sneak into their parents liqueur cabinet when they are not home. It is like saying to prevent suicide we have to make all guns and sharp objects illegal.
And it was illegal when she first tried it. Little girls shouldn't be exposed to lots of things that adults do... but the answer isn't in big government banning everything for adults.
In fact, I would argue that the more we rely on big government to tell us what we should or shouldn't do the less we rely on ourselves and our families, and that makes us more susceptible to danger in the long run.