In the novel he cut her head and placed some magic to keep it invisibly connected to her body but without the collar it pops off and can't be reconnected since it acts like to two magnets being pushed together but is being repelled, he did make the same threat as he did in here but the fight didn't last long enough to show her skills other then defense
Once this gets an anime adaptation (because isekai reincarnation fad), I'm expecting some cultured tomes of this cursed incest-but-not-really-because-reincarnation pairing.
Most likely next time if you think about it. She'll probably ask someone to break the curse. @conscript117 and the King is still alive somewhere probably.
@kaminomikan Gondo Zenphis is actually the king's brother and tends to stand against her politically. Added with the fact that Char has higher talent than her, and has royal blood, she could try to seize power in the future.
@kaminomikan just like @MayhemTrinkets said. She is threat to her because She can replace her as the queen in the future, and Char had higher talent meaning the Queen will be overshadowed in the future.
As the Queen is a pile of useless greed, she won't allow that.