I'm still struggling to understand how a champion with a presence of 43% in the LPL and 52% in the LCK is anything other than extremely strong. Pros don't pick weak champions.
She actually fits one of the criteria for an instant nerf in their balancing framework, which is a >45% banrate in challenger.
I will only comment on one thing which is that pros will absolutely 100% pick "weak" champions, and in fact do so very often. This is of course if your definition of weak champion is purely by low winrate.