StormCaster has reappeared so many times , in the most plot stretchingest ways I'm sure they'll figure it out. I mean look at her Ruby. Destroyed and some how cannon was never destroyed.
Also seeing how when Asgard was reborn so was StormCaster. Which always lend to the idea of Storm Divinity.
Remember without the hammer Storm is considered a DemiGoddess amongst the Asgardian.
And the way Loki forged it. It was made by the gods for the Goddess