She looks at him when he speaks, but the responsibility comment is too much. "You are not my guardian." Ways in which Morgana does not want to think about the Doctor: as a guardian tops the list.

She gets to the top of the stairs, only to be confronted by a very angry king, wielding a very large sword. All he says is one word, witch.

That sound, unlike the earlier, unearthly scream, is Morgana. To anyone else in the room, there would be nothing there.