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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This information is my theory but I think she is a fallen from the future. Who has seen the mistakes she and her comrades have committed. She has formed a group and has traveled to the past to help the guardians take back earth from the fallen. The clue that gave this info to me is that she called the ghost little light which seemed odd it's like she knew it and had seen one before.