Their rivalry begins with only Jerome Alvarez as Darlene treats her like trash. After revealing she was Giselle's daughter and the rightful heiress to the Carbonels after Perlita exposes her biological mother's scheme. Darlene could not accept the truth as she takes her to her car for a joyride as a result of the car accident, Marilyn's ugly face was disfigured causing Darlene to be in jail for her actions and she along with her family to take her in the US for her face surgery. In later episodes, Marilyn becomes beautiful and fine lady after the accident as Jerome likes her appearance. Despite the Carbonels ending up bankrupt, she decides to help her family. Her rivalry with Darlene continues when she was revealed to be the daughter of both Perlita and George, both girls went into a physical brawl. Darlene accidentally knocks her in a stove causing a fire in a kitchen. Marilyn was later saved by Perlita before she dies in suffocation. After her step-mother's death, she thanked her for taking care of her. In the end of the series, she and her family decide to travel the US as she gives farewell to Jerome before she leaves the airport.
