Yeah, I'm all for the theory that the girl is just rocking her new hero body and roaming around incognito now. Otherwise, it did say that the contract with the demon lord should have been broken and her soul was able to go to the good place if so, which seems to imply the alternative was horrible. So, the worst case scenario is that she is not the big bad evil guy's toy right now. That's something, isn't it? It's all about how you frame things.