Clara is in Laura's side-quest. You can reach her content by entering her study and pressing the button underneath the dresser.
Glad you enjoyed the game!
Yeah, after a second playthrough I found it. I like the little ghost possession side story, but restarting the game just to find another character that I didn't know about was kinda annoying. Maybe is there a way to improve it?
Alao, would love to see more Clara/Laura interactions in the future. Can't wait for future updates