Moving Screen? (Block)

[crazy voyager]

If she is in position first and she does not hold the defensive player (or extend herself outside her cylinder) I don't see how this could be an error by the offensive player.
If she is there first, she has all right to run infront of the defensive player (within her cylinder) even though this means the defensive player can't get to the ball.
If a defensive player where blocking the part of the offense (they are there first sliding and being in the way) is that a defensive foul? I'd say no
I think you made the right (no)call