[spoiler]She can travel through time, her rifle was made with components that 'should not exist yet', she was likely trained by someone in the future/past.[/spoiler]
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Yeah maybe she's stolen some vex time travel technology
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Well the Vex have a biological core, even if they work as one mind, they're still living things. Just like Exo's. My money is on that, whoever built the Vex, built her. As some sort of experiment. It all went wrong, she broke free, etc, and now she helps guardians to kill her creators. Why do you think she knew where to stand on that Vex to cause it so much pain? That's all just speculation, so doesn't deserve a spoiler.