When we first saw this mysterious guardian in the very first mission I though that she would help us later on. However, later on during the first moon mission we see her face and because of the cloak I'm guessing she was a hunter. In the scene that we see her she seems more like a ominous threat. Why else would she let us to fend off the hive horde alone.
My theory is she used to be a guardian like us but then her ghost died, and she went rogue trying to steal other guardians light, and become the traveler's worst enemy yet.
I don't know but I wanna know. any thoughts, theories.
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She is "The Queen" the leader of the organization on "The Reef" she is an awoken hunter, and also has a few loyal fallen as well. You'll see her later, I don't know exactly what, but you'll get missions from her later in the story In sure.