That's the thing, though. This isn't the Pre-Crisis origin. That one had Kara be born in Argo City after the destruction of Krypton. No, King here fused the modern origin of her living through the death of Krypton with the Pre-Crisis origin of her living through the death of Argo City and combined them for maximum angst so she didn't survive 1 holocaust but 2 (and actually 3 by also adding the deaths before installing the lead shields) while also innovating in the angst department by having her work on the lead shields of Argo and killing Alura before everyone else.
So my initial reaction was less "oh, poor Kara" and more "King really likes his angst porn, doesn't he? But then again I already knew that". Again, this might change in re-read.