The time has come for the Exo Stranger to reveal to you her secret.
In another timeline, her original timeline, she failed to stop the Darkness from manipulating Guardians and bringing about a second Collapse. Since then, she has been carried through time, trying again and again to prevent that dark future.
Looking at you now, she finally sees a future in which she might succeed. She thanks you, then reminds you that the fight has only just begun. More Guardians must take this path towards Stasis. She'll be here to guide those that do.
Keep up the fight against House Salvation and all the other enemies of the Traveler. And don't forget: you have an ally in the Exo Stranger. Return here to learn more about her past and any other secrets that may help you on your journey.