Conqueror and Presence of Mind broke her. Before the rework of these two runes, she had a super healthy 6% play rate, 48% win rate and 20% ban rate in Masters+, after these two runes, her play rate doubled, ban rate went up to 60% and her win rate is anywhere between 52% to 58% based on M/GM/C and region.
It's clear as day what broke her, and those runes broke other champs as well, such as Mordekaiser, Lee (more than he was), Kassawin (PoM is nuts on him), and Koreans stated taking Conqueror even on assassins such as Kha'Zix, Elise or Nidalee or teamfighters like Kennen simply because it is that good.
But since they don't want to nerf the runes, which are simply broken on anyone who can abuse them, they nerf one of the champions abusing it, but miss the mark.