This is exactly why she should have quit when her hand was injured. It was obvious something like this would have happened when her hand wasn't healed properly to begin with. I don't know what made her keep going...greed for the trophy or passion for dance. I'll give her the benefit of the doubt and say its passion for dance since she's a trained dancer. So hope she feels better and the injury is not severe and finally realizes that health comes first.
Having said that, let's face the elephant in the room, shall we? Its good she has quit for whatever reason because her stay on the show without performing three weeks in row was unfair to the remaining three. Now that she has left voluntarily, the others can perform freely with no added weight on their conscience...that guilt or resentment of performing with an injured on the same platform. Now the scale is balanced and the contestants can rest be assured that the voters will look at dance mostly and NOT send in sympathy votes.