You gotta beat her down emotionally and mentally. Then take that last bit of hope, raise it, and then shatter it under your foot.
That’s vengeance.
I'll never want to be on your bad side
Omg (・ω・)
Oh god truly magnificent
Oooh
The best type of punishment. We don't always have to resort to killing. There are fates far worse than death and this is hers.
Oh damn that's dark af. But I'm about it. Ily be my friend.
Execution is too simple.
They need to invite her to their wedding. Have her watch them get married and be so absolutely happy together. She can sit in the back row, gagged or whatever. Then the FL should tell her all about the honeymoon. In detail. Force the girl to be a part of every amazing life that the FL and ML have together.
If she snaps again at any point, get the execution date planned. At the last minute have the ML ‘save’ her after confessing he cares. Only to pull a last second Hans and be like “if only there was someone out there who loved you.” And drops her off at the execution block.