Yep, I still think the queen is either completely or partially possessed. The spirit of of the demon lord possessed her after she killed him. That is my prediction.
So yeah, calling it now. Turns out the queen was possessed when she killed the previous demon king. Over the years he has poisoned her mind, making her do things she wouldn’t normally do, all the while gaining more and more control over her. I wouldn’t even be surprised if the demon king was...