My analysis of the video:
I interpret this video as a parable or allegory of the influence of feminism on women in Western nations, in this case played by a little girl. While many of the commenters said that the video was cute, there was a darker message in it. The little girl imagines herself (without evidence) as being oppressed, then imagines a little boy in her preschool (without evidence) as being unfairly advantaged. When she gets a ball and thinks it will win her respect, she is dismayed that the little boy has a much larger ball. She then pretends to befriend the boy in order to manipulate him into letting her play with the ball, which she then proceeds to abuse and deflate. When the boy ends up crying over the loss of the ball, she rationalizes that what she did is just the way things are done.
While my initial reaction in the early part of the video was that the little girl was adorable, it was later tempered by the realization that young girls in Western society often develop into women that may manipulate men they are jealous of into a relationship which they end up sabotaging, knowing that they can gain financially from a divorce.
There is also a theme of Marxism in this video (i.e. the little girl represents the proletariat, while the little boy represents the bourgeois). A Freudian interpretation of the video may be one of emasculation (i.e. the deflation of the boy's bigger ball).
While the little girl who played the part was, of course, just an actor, the scriptwriters' moral apparently is that if you can't gain social status through honest means, then manipulate people into getting your way. Perhaps unintentionally, they have highlighted the way males and females interact in Western culture, as indicated by my earlier comments.