I would say that "the girl" is "la quinceañera" and her party is "el quinceañero". For example "I am going to her 15th birthday party":"Voy a ir a su.
Amazing Quinceanera Video - Jasmine 15th Birthday Party Video by www. xisf.org - Duration.
Quinceañera also called fiesta de quince años, fiesta de quinceañera, quince años, quinceañero or simply quince, is a celebration of a girl's fifteenth birthday with cultural roots in Latin America but celebrated throughout the Americas. This birthday is celebrated differently from any other as it marks the transition In Spanish, "Quinceañera" literally means "Fifteen-year-old female". Origin · Changes over the years · In specific countries · Quinceañera's new traditions.