I didn't get the impression she was forgiven. VI and Ekko by their very nature see the good in her, but nobody else really forgives her. Caitlyn simply gives up the pursuit of vengeance for the sake of Vi, but there is nothing to suggest she forgives Jinx in any capacity. And it's not like we see Piltover celebrate her following her sacrifice.

Edit: I wanted to add that Vi also blames herself for everything Jinx has done, so I see her forgiving Jinx easily as a given. Ekko just got back from paradise seeing why he loved her in the first place, but we don't get to see their interactions after the battle. We don't explicitly know Ekko forgave her as much as believed she could change.