Board Thread:Rewatching "Merlin" - Season Three/@comment-5102537-20130810111259/@comment-4814726-20130813031042

So again: why did Morgana always claim that Uther didn't love her? Morgana firmly believed that Uther didn't love her because she was convinced that Uther would hate her if he knew she had magic. It's not too big of a leap considering all the people he's killed because of the same reason. Even Gaius was sentenced to death for magic, and he was a close friend of Uther, or as close as you can get without a blood relation. Morgana probably thought all of the concern Uther showed her would turn into disgust if he knew about her powers. And after a year with Morgause that belief was most likely enforced by brainwashing or spells or whatever happened to change Morgana so much.

As to why she became a person who enjoyed torturing people she had once loved, even Gwen who never did anything to her, and the innocent people in the city. I have no flippin idea. Maybe Morgause put a spell on her. Maybe Stockholm Syndrome. But I agree that the change wasn't normal.

Obviously the showrunners didn't think that was terribly important though.