Interference

[RKBUmp]

On a batted ball you cannot interfere with a defender who is not the player fielding the ball. And a defender who is not in the act of fielding a batted ball cannot hinder the progress of a runner, it is obstruction. The only other question based on your post, did the runner purposely run over the SS and plow her into the ground or was it simply 2 players getting to the same place at the same time? If it was intentional, you could have an ejection on the runner.