So there is a bug where Sylgja somehow disappears from the game, this happened to me as well on the pc and using console commands like prid refid or moveto didn’t work either she was absolutely gone from the game it seemed.

What I did to make her reappear (by accident) i broke into her house and slept in her bed for 8 or 12 hours and when I woke up she was standing in-front of the door.

Hopefully this will work for other people to on the pc and game console…