I like that Yellowjackets went the "actually, the supposed mental patient is, in fact, a prophet" route.

It's the true horror for Lottie, the Wilderness being real. It's something inside, yes, but it's also a mystical force. It's everywhere. It's the true God (well, Goddess). It's so poetic, I love it. I could write a litany about it. The show executes the "actually, insanity would have been a comfort" trope so well.

I think, the Wilderness is a Lovecraft-level eldritch primordial entity, but folktale instead of sci-fi.