To be fair, all she did with the rubiks cube was twist it a little bit, she did not actually solve one that was sufficiently scrambled. It started out unscrambled and she only made a few simple turns that anyone can easily unscramble. Additionally, solving a rubiks cube is not impressive at all, even I can do it. Neither is memorizing 100 digits of pi. Anyone can do that.
Really, the only thing impressive about this feat is the balancing of 15 books on her head and I am sure there is someone somewhere in the world who could do more than that.