Defiant Heiress: Never Cross Me!

Sable is engaged. Her fiancé keeps up an unclear relationship with a woman he calls his best friend, and the woman starts needling Sable. She sends Sable a video of herself and the fiancé together. At the wedding she makes a scene, and she does it again at a birthday party. She hires people to set Sable up. Sable does not let any of it pass. With her own head for these things and her family's money behind her, she makes the affair public, arranges a livestream in which the two of them show themselves up, and gathers evidence of what they have done. The woman then throws a paternity test at Sable and says she is not the family's real daughter. Videos made with AI and a switched DNA result both turn out to be part of a plan to get hold of company shares. As the fight goes on the woman's own background comes out. She is a criminal's daughter, and she got close to Sable's fiancé for revenge.