I know what you mean. This is not the best story, like, why they hate her so much. But, I can't leave this kinda story.As a sucker for these types of stories, thank you for translation!
Jealousy is a vile beast.like, why they hate her so much.
The most disturbing thing is how they collided to do it, and cover it up too.I feel the power theft is relatively unique compared to the generic power drain, given she still has standard levels of power (so it didn't drain everything she has, and doesn't seem to be a seal), and messing with those memories in particular.
Honestly, the stealing power to get what they want is fairly standard in these stories, the bigger surprise is they didn't try to directly kill her. After the sister ignores the job, I hope someone else knows about the existence of the power-moving item, and brings up they should use it to move the power back to MC since she does so well with it, and we get to see how they keep suffering trying to keep a secret they already stole her power with that item to give it to someone useless.The most disturbing thing is how they collided to do it, and cover it up too.
I hope very much for her family and ex to be thrown into snake pits. At least she met someone kind.