Yes. It doesn't matter if the Wall of Illusion is face-down when the attack was declared.
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A monster in face-down Attack position is unable to declare attacks. It can be flipped or Flip Summoned, both actions will switch it into face-up Attack position. It can also have its battle position change by the controlling player, switching it from face-down Attack position to face-down Defence position.
If "Harpie Lady 3" is destroyed while face-down by the effect of any LV "Mystic Swordsman" or "Sasuke Samurai", it's effect will not work since it was not flipped face-up. If it was attacked while face-down, it is flipped face-up and after damage calculation, it's effect will activate.
send it to the moon
Well some do, i know for a face that the Chimaera models work with XBOX,not sure about the others
press l+r+b and walk into a wall! there it worked