All that time hanging out in Eridian ruins on Pandora? Remember the Dahl dudes on Elpis that had inhaled all the purple vapours and somehow mutated? I’m imagining one possibility is something along those lines, but more subtle.
I’m also imagining that at some point something happened, and she was cloned into a biomechanical replica of herself (the Guardians in TPS are all biomechanical entities that just happen to look like Eridians, so why not?)
And finally, I’ve always thought that some of the Varelsi looked like some of the Eridians.
Hey, let’s put 3 and 3 together and make 33!