What's the point of a girl wearing a bracelet in her left hand?

There is nothing particular about wearing bracelets. Usually wear bracelets for beauty, so both hands can be used.

Of course, some people will pay attention to this. Generally speaking, there is a stress on "going in left and going out right". Meaning can bring good luck to oneself, usually worn on the left hand; On the contrary, what is worn on the right hand means to ward off evil spirits. In some places, it also means "male left and female right". Dress according to local customs.