Diana the "Fighter"

Diana is in no way shape or form a fighter as soon as she hits 6 she can beat almost any mid laner without then having a chance to react because of her burst as a "fighter' as riot puts it, a fighter cannot 100-20 a tank with only 3 abilities being cast so to fix this it would be easy just to nerf her base damage or ap ratios so she dosen't land Q then ult twice and you're dead so please riot fix this so called fighter....