Honestly there's a decent chance she doesn't live past the movie.
I mean I don't know how fucking real they want shit to get right off the bat, but I'm seriously expecting that at the very least Toffee is going to win again and Butterfly Castle will fall.
Toffee is such a threat right now that the show cannot restore any kind of status quo until his situation is resolved one way or the other; Moon isn't about to let Star go adventuring after Toffee just directly threatened her. Moon and Star are going to be licking their wounds and preparing for Toffee's assault, while Toffee is rallying an army. Either Toffee has to be neutralized or Star can't have a safe place to take shelter.
Unfortunately for Star, the narrative has played out in such a way that Toffee cannot possibly suffer any significant defeat at this point, while she is perfectly positioned to have the last bit of suffering squeezed out of her by losing what little she has left, before the story can re-introduce Marco into her life and give her the cruel hope that everything could be okay again.