I think this issue DID establish SW as a Kryptonian. Last issue's statement about "not a Kryptonian' because not affected by Kryptonite was meant for Reactron and also for we readers. Apparently the suit protected her FROM the Kryptonite, and , since she could sunbathe for real, most likely she's Kryptonian. Question is, which one? It wouldn't be 'fair', though it's been done before, to have her be someone we haven't met as of yet. Thara's Flamebird. We don't know any others, do we? Ursa and Allura are both evil enough, and only Allura needs to wear a mask, really. And she did, when she first showed up, say exactly the same thing Allura had said about Kara's Supergirl career about 3 panels prior. So, either her or a multiple number of Superwomen, though that's becoming less likely, as we're losing candidates.