I've said it before but the cleanest way to retcon Linda is to say she was a human girl who fused with the Kryptonian goddess Flamebird.
You still keep the supernatural aspect of her origins, the spiritual/religious themes and dual identity of ones personality merging with a non-human entity it just now ties back to Superman's mythology more directly and her unique powers like flame wings make a lot more sense.
You can still keep the broad strokes of her history of an ex cultist who was saved from sacrifice and took her second chance at life to redeem herself by using her new powers to fight demons and the like in honour of her favourite hero Supergirl. Not sure if Kara still supoosed to have "died" in current continuity but you could just say she was out of commission for a while.
Heck she was almost originally going to be Flamebird (and Conner Nightwing) during the New Krypto arc before Dan DiDio stepped in and it had changed to Thara and Lor Zod/Chris Kent