In no case does it ever matter whether or not a player has played a shooting card.

You Can't Kill Me is a shooting card, but you choose another player to do the shooting. They do not play another card. They take the shot that TCKM gives them.

If you copy YCKM, then you choose a player to take the free shot. The person you choose also chooses the target.

She can be shot by Red, Blue, and Green Beths is what is means. Any color card can shoot her.