That's just Matrix.
This is the
Supergirl in question.
Huh.....something stuck out in that link under Earth-Born Angel bit.
"She also discovered that she could teleport in a S-shaped burst of flame."
I think that covers Robin's find.
She bamf'ed her way across the world, burning things with a demonic taint.
So we have:
-Buzz
-Linda Danvers
-A Linda Danvers/Matrix looking person with Flame/Flying powers.
Considering the lack of evidence for Matrix in this world, short of universe hopping, we're looking at the Earth Born Angel side of things without her.
I figure that Linda was in the cult with buzz, somehow awakened her angelic powers. Likely during the whole angelic invasion, as they did seem to strike at demonic presences during that period. Also Zauriel himself makes an appearance in the original story covering his explanation of what the Earth Born Angels actually
are, parts of God's feminine side, kept within the earth, and reincarnated throughout history (the Earth part makes me wonder...Gaia ? The White Light Entity? the actual "Shechina" ? or just another archangel getting by with humans again?)
Burning things that could be connected to Buzz could be her going after her former cult leader for trying to sacrifice her. Buzz might have been the supplier of the book, and other items burned. She's not wiping evidence so much as cleaning up all the dangerous stuff Buzz has left laying around. Likely been leaving it out as part of some Hell scheme to propagate demonic magics and powers now that the world is waking up to the fact that magic exists (Thanks to OL).
Only thing really left is....is she actually wearing a supergirl S on her chest? Why?
Is she wearing it because she, having suddenly found herself in a role of a hero, wanted to use Kal-El as an example and reminder? Is there an actual Kryptonian cult out there? (DC's used them a bunch, particularly around the resurrection stuff)
Or maybe she was just a fan girl and thought it looks cute?
With those boots....I think I'll go with the latter.