There seems to be a bug in 18.2 that Scylla doesn't have any armor. If any of her body parts drop to 0 HP, they stay that way permanently (resting, bandages etc. nothing helps) and cause you to have that body parts tooltip at 0/0 HP in combat permanently visible. This blocks you from doing anything basically softlocking the game.
EDIT: Trying to redo her recruitment quest and same happen. When the large combat starts where you fight on her side, she has half of her body maimed and zero body part health. When you get her in your party she stays in the same bugged state. If she gets further maimed in this state the game soft locks in next combat with body part tooltip blocking your actions.