I think she is either a random bad ass, future war cults leader / lost leader / first leader or future you.
Now your conscious I'm sure could be "downloaded" into an Exo so I guess that's how I explain that to myself (as her always being a women)
Do I think I'm right? -blam!- no. But it's my theory lol
I do like your theory though
English
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Nope. We are guardians, forged in the light. She could not be us.
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True but there can always be plot twists I did also say even I think my theory is a "-blam!- no" one lol :P