Just delete diana
It's simple. AP Assassin that has a shield, passive auto that does so much damage, a knockup, and infinite dashes. What part of Diana is balanced. Literally nothing. What is the point of Magic Resist if it does nothing against ap champions. You can't one-shot her because of that stupid shield and she can one-shot you faster than any other champion. Plus she takes no skill needs no items and doesn't need to be fed in order to one shot someone at level 6. There is literally no counterplay. You don't even need to hit your Q in order to one-shot. Just RWE Auto. Pretty brainless. Just enable auto attack and spam buttons. Just at least nerf her or something? See what happens? Can't hurt the game only make it better for the rest of the players.
dishing out DPS over multiple autoattacks. Sadly, AP fighter itemization is nearly non-existent and any attempt to play Diana as her kit was intended is counterproductive when compared to her <1 second burst strategy (which is also feast or famine and sucks for Diana players)...