When someone cancels shadows Adrienne's response, will the person get to see the plot that is chosen prior to canceling? I think not, but this came up the other day.
The logic for the other point of view is that whenever there is a trigger that reacts with other cards, the player must identify the target as part of playing the card. Another example is Die by the Sword. Does the player identify who is targeted before the opponent decides whether to cancel?