But there wasn't much conversation between the will that got to demon king and her. (I think it was magic in charge)
It's mostly demon king going WRYYYY WHY WON'T YOU JUST DIE and try to resist while the will goes haha spider goes nom nom
Then at some point the demon king more or less was resigned she was going to lose, but at that time Kumoko evolve one more time and basically returned all the wills back to her.
But at this point the demon king's soul and that particular will have basically mixed so much that they can no longer separate
So while the will 'shut down', the influence of Kumoko's personality remains
And you get basically Maou Shoujo Ariel demon king from that side chapter earlier (that's a flash forward chapter)