(WARNING: None consensual sex: Rape. WARNING: Brutal treatment, torture, and forced agreement. You've been warned. It's quite cruel and awful.)
Unlike Mrs Lee, who had lived like the best daughter and role model to all girls, she was the outcast. They were from the same family, the same parents, and even looked alike, yet she was treated like dirt just because she was not good enough.
And now her sister wanted her to do what? Give up one of her eggs so she could get a child?
It would have to be over her dead body because she knew very well the kind of fate the child would suffer at the hands of her sister.
The world may not know it but she knew it for sure. Her sister was a monster, so giving her a child that wasn't hers would be the same as throwing that child into a pit fire.
Mrs Lee got angry and literally kidnapped her sister.