It’s odd that she can make normal relics from seasonal ones, but not the other way around.
I know seasonal content is meant to be bought, but I think that allowing her to craft them will encourage more people to buy/play the seasons. After all, why would anyone without seasonal content spend the resources crafting the corresponding relic?
Also, have you considered having a follower “workshop” tab (story¦battles¦rewards¦workshop) within the seasons? That way Toragon and the others could craft seasonal content without people being able to skip paying for the seasons. There could even be a (much smaller) levelling up requirement, if you felt like being mean.