It was actually Datamined that it was Osiris she was Talking too. In D1 Files She wasn't know as the Exo stranger, she was a Disciple of Osiris. Pretty much his main Agent.
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That’s the og storyline data. In her lore cards, you can tell she comes from an alternate timeline.
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That's what I was Referring too. Now we don't know at all who she was talking too. Even though, the D1 File of her, if I remember correctly, her Code Name is "Disciple of Osiris".