Both. Except she never chose to be a villain, feeling she had no choice but to do what she did. Though of course she did have a choice, she was just too scared to say anything in case it got back to her controller. Also, she didn't feel she could confide in Gibbs, because she was not blind to the fact that he had a very VERY low opinion of her as a field agent, a lawyer and a person. I'm not saying it was Gibbs' fault, it's just that they just rubbed each other up the wrong way so much that, with hindsight, he was always going to wind up killing her.
Perhaps the greatest tragedy of all is not that she was a fundamentally good person forced to act against everything she believed in to keep a loved one alive, but that her shaky relationship with Gibbs would be resolved in this way, with them only seeing eye to eye with her death.

A lot of people , I've found, disliked Michelle. But, there was a lot to like, if you were only prepared to look hard enough.
So, rest in peace Agent Lee. Some of us, who got what you were about, still miss you.

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I saw Agent Lee in a movie in the winter. She was in the movie 21 as one of the blackjack card counters

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