Well it's really on purpose.  Zhao family want to make FL a hostage so FL mother come back to the zhao family or at least give the company to her brothers because FL mother is the best at managing the company but the zhao family just want the sons to inherited it.  FL mother didn't want to do it because the company is her hardwork, so zhao family kidnapped FL but lost FL in the process. And this is why FL mother hate zhao family but can't do anything because there's not enough evidence and because it's still her family.