Flinderella (2004)

Florencia Fazzarino is a poor girl but her personality is worth millions. She is funny, energetic, and superstitious. In her early 20s she finds herself the new nanny of the Fritzenwaldens, a German family of five orphans. The eldest, Federico, is in charge and his strict education and behavior soon clashes with Flor's style, making her call him 'Freezer'. He has a girlfriend, Delfina, whom everyone calls the Witch because she and her mother Malala are always doing mean things to them. But Florencia's behavior and energy distract Fede from Delfina and he 'melts' over time, and he and Flor fall in love with each other. Malala and Delfina have an economic interest in Federico because when Delfina's father died, he left them with no chance of claiming the inheritance money unless they find his secret illegitimate daughter. Delfina's main target is Florencia, the threat to her only chance of being rich again.