I was told some of what occurred on Tatooine by Padme, but she likely didn't know many of the details, either.
[Which she leaves at that, because she doesn't trust herself to say much more than that. She may only have Obi-Wan's word, and Obi-Wan himself might not have the full picture, but Leia is deeply offended by the idea that losing two people, Padme and his own mother, was somehow enough to push him over the edge and turn him into something as monstrous as Darth Vader. Obi-Wan would have to be deliberately ignoring it to not notice the extreme surge of emotion through their connection. As much as she feared how many similarities she might bear to Anakin and what her relation to him might mean for her own future, she can say for certain she never contemplated becoming like that. And she had lost far more than only two people.]
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[Which she leaves at that, because she doesn't trust herself to say much more than that. She may only have Obi-Wan's word, and Obi-Wan himself might not have the full picture, but Leia is deeply offended by the idea that losing two people, Padme and his own mother, was somehow enough to push him over the edge and turn him into something as monstrous as Darth Vader. Obi-Wan would have to be deliberately ignoring it to not notice the extreme surge of emotion through their connection. As much as she feared how many similarities she might bear to Anakin and what her relation to him might mean for her own future, she can say for certain she never contemplated becoming like that. And she had lost far more than only two people.]