User blog comment:LadyHelena/Revelation- SPOILERS EP11/@comment-5845325-20121223224526

Morgana definitely didn't know it was Merlin. When she found out, I think she was in shock. For all we know she might have been angrier and we just didn't see it. At that point Morgana was very powerful, so I doubt she felt as threatened by Emrys as she did in season 4 when she was living in a hovel.