Diana is fine.Riot plz dont redesign her abilities.
She was OP back to S2 and early S3. So Riot nerf her QWER Range , Base damage and Ratio in many patches already. Especially her Q base damage is 200 now , while other burst mage have 250-300 base damage. But I think she doesnt need a Buff/Nerf to her ability base damage or Redesign. Just keep her same. She is balance and healthy! BTW ,Akali is another Assassin that have similar attack parttern but have a better passive and easiler to snowball. So if Riot wanna change my Diana,plz think about Akali.