How is she doing it? At first I assumed the reaction between the Travelers death and Eris Morns power sent her back but why would it just send her back. I haven't done the Raid so if this is explained already then disregard this. What if Elsie is hopping between different variations of her conciousness in other realities at the same moment each time? Radiolaria and Vex tech was highly involved in Exo creation and we know that groups of Vex themselves are often connected to a single mind so what if Elsie (who has no resets to my knowledge) unlocked this capability unknowingly and the collision between light and dark triggered this kind of flight response to preserve her conciousness and inhabit one of her other "minds"? Just a theory. A crackheaded theory 🙃