To be fair her opponent was twice the ball-basher Serena was.
That's not the point. Serena winning RG would be like Tsonga or Berdych winning it on the men's tour. There are no players with perfected clay game on WTA. Even Henin the greatest CC player of her generation was not a true clay courter - her play style was more close to Nose's. A true CC player would be something like Stosur with 5 times the agility.