It's because she's a protagonist that metamorphosized into an Anti-hero. And yes, that's in the lore... So, it's called Subject 12... that's the Vex Prophet. It told Maya many things... but one thing specifically was that, the only timelines where life even has a chance of survival are those in which she becomes the conductor. The exo experiments were used to verify the credibility of the Vex Prophet's information. And in Veil Containment, those Chioma logs were experiments to flush out the permutations' respective the Conductor. To prepare Chioma for that sacrifice... to inherit the echo of command and take control of the Vex collective. SiVA is part of that. That's why the Conductor is in the Plaguelands, that's why there are dead splicers on the ground in Reclaim.