https://wccftech.com/the-witcher-3-prociri-mod-rebalanced/

The Witcher 3 features Geralt of Rivia as the only playable character, but at certain points in the story, players can control Ciri and use her unique powers to obliterate enemies. Some mods released in the past years made Ciri fully playable in the game, but the character was not rebalanced, breaking the experience in several ways. A new mod that has been released recently fixes these issues, enhancing the character as well with new and improved mechanics.

The Witcher 3 ProCiri mod introduces a new version of Ciri that is not only fully playable but also tweaked with improved mechanics and some rebalancing that prevents battles from breaking, such as enemy scaling to level 100 and more.