Right to privacy

I'm an engineer currently staying in Bangalore for my job with my wife and son. I have been married for more than 7 years and my son is 2 years old. My father is retired pensioner and my mother is a housewife, they both are old. My parents struggle financially and I consider this my duty as a son to help my parents. But my wife does not want me to send money to my parents and she fights and screams whenever she learns that I have sent them money. I tried sending them money secretly but she interferes in my every matter and always keeps tab on my financial issues. I told her that this is my personal matter but she claims that I cannot have anything privacy since I'm married to her. If I do things without her knowledge like sending money to someone, she will leave me and obviously she will get custody of the child. I feel she is mentally not okay and needs treatment but she refuses to get any help. She claims that she is mentally fit and I'm the one who is making her look insane. I do not want to divorce her, I just want both of us to understand how we can fix our disagreements. But she is not even willing to go to a marriage counsellor. Please help.