Why is Minerva in conflict with her father?

I think youmight be referrin to Minerva finding out that her father has kids from another woman. Out on drives, she begins to notice her father's Ford always parked in front of the same campesino family home. Four girls run out to the road, and she sees that they have Mirabal eyes. She realizes that Enrique Mirabal is their father and that they are her half-sisters.