She doesn't want to go home. :( In fact, I imagine she'll announce on the network why - and ask if there isn't a way to save this place.

If Prim goes home, she dies. Big explosion. Charred body. No more Prim. She's not going home, because there's nothing for her to go back to.

That said, I'm fine with her being forced into another world - I think she'll end up in the_devils_see though