User blog comment:Knightofthecart/Morgana has turned her back/@comment-4650675-20120312192317

In my opinion, the events at the 2x12 were all a big misunderstanding. Merlin thought that Morgana wanted to bring Camelot's doom by agreeing with Morgause, while Morgana thought that everything had happened in her dreams. She did not know she was the source to an enchantment, and Merlin didn't know she didn't know it. As to when she turned her back on her friends, that's what I think.

She turned her back from Uther at an early point, after he killed her "father". He also killed many people of her kind, locked her up in the dungeons whenever she challenged him and had her live in fear of her powers. When she learnt who was her father, she gave him a chance but he chose not to tell her she is his daughter, thus denying his own flesh and blood. She also gave up on Merlin after he poisoned her, which does not sound so irrational.

She turned againist Arthur immediately when she learnt he was her brother. To her, Arthur and Gwen were just necessary sacrifices for her to get the throne and have magic return to Camelot. She also felt betrayed from Arthur and Gwen, because when she was facing her toughest times with her magic they weren't there for her, Merlin was (who also betrayed her). Finally, I think she also was a bit jealous about Gwen, who had everything. Her got stripped from her brother's love, her people's love, her throne, everything. All to a servant girl. She just cannot stand it.

Those are my views on why Morgana turned her back on everyone! Her actions can definitely be justified easily, if you think from her point of view.