
ColourMePurple:
I thought this was dumb because Khem was a child. She should have cursed her husband and his first wife's rebirth cycle. But she took her anger out on a child who was scared into lying.
RE: Khemjira
In episode 9, Ramphueng first cursed them with "May you all die a violent death" as she was led away. As Khem and her ghost watched her near death being whipped, she placed another curse: "I place my curse upon you all. May your line be struck with misfortune, with no sons to carry your name. If you die, may you be reborn, and I shall claim my vengeance. Should you be reborn a woman, may you suffer separation from your beloved, either from being parted, or by death, as I was parted from my son. And should you be reborn as a man, should death claim you at 21, as it now claims me."
Ramphueng shows how his ascendants and their two maids have died, she appears again and says, "All have faced their karma, except you. You're the last one. Only then will my hatred finally fade."
To me, this last line is crucial. I'm interpreting it as everyone involved and their bloodlines have met their karma. As much as Ramphueng wants them to be reborn to face her wrath again and again, she's not in charge of their reincarnation, so some of them may not have been reborn. Khem is the last one, she says. Once she kills him, she will find some semblance of peace. And maybe it will fade enough, so that she's no longer a vengeful ghost by the time Khem is reborn (if/when?).