Seeing the new spoiler most of us have assumed that Madhu is doing this to take revenge. Don't know why I am thinking slightly different. May be I like Madhu little more than RK😳 and I am defending her act just like RK'S fans were defending his act at the time of his revenge track😉😆.
I feel Madhu is doing all the tricks just like RK but not for revenge but to give him a big jhatka to make him understand that it is time to shed his BIG Fat Ego. He thinks that he possesses supreme power with which he can do anything. By hook or by crook he wants to control everybody & everything. We saw that whenever Madhu looks at the poster of RK's Ahankar movie, camera always zooms at the word 'Ahankar'. RK's biggest enemy is his Ahankar. Madhu knows very well that if she succeeds to break his Ahankar then only RK will realize that he is just a mere human & not the Almighty God. And for this Madhu wants to make him taste his own medicine. Once he understands that he is a mere human and nothing more than that, he will then only look at the world from the eyes of a true Human, feel the sufferings that he has inflicted on Madhu and the other people around him and regret it and try to make amends for it. His redemption will start only then. The moment he will be able to feel Madhu's pain, the insecurity inside him will slowly dissolve.
PS : It's totally my Point of View