This is not due to a quest. I tried to move Leia from Mustafa to Mon Cal, due to her governor bonuses. I used side scrolling to "drag" her to initiate movement.
Instead, she went "invisible". I can see that she is still on Mustafa(as it gets increased income), but I cant see her, pick her or drag her to a new location.

Does anyone know a fix for this? I have tried to save/reload.
At least she is doing "some good" where she is, but I have no idea if this might end up blocking missions in the future.