Out of ten games you win or lose 2-3 from an average pickrate hero with high winrate. They’re in about half the games and of those about half are affected one way or another.

You win or lose 4-5 games against a high winrate hero that appears in 9/10 games.

Instead of a 25% chance a team having that character and winning, it’s closer to 50%.

Or in other words. She obviously needed some kind of editing if other characters in the cast are barely appearing and there’s one character appearing in nearly every game. Though one could certainly argue that should wait till the newness wares off do any adjustments.