Marengo early television experience includes co-hosting Mar de Fondo with Alejandro Fantino on TyC Sports.

In 2006, she participated in the reality TV show Expedition Robinson, the island VIP, which developed on a beach in the Dominican Republic, where she finished in fourth place.

In 2007, she appeared on season four of Bailando por un Sueño, a dance competition portion of the television program Showmatch, hosted by Marcelo Tinelli.

She danced to "El Baile del Koala", in a routine that involved a woman breaking a man's pelvis, making moves on his waist, and mimicking sexual intercourse.

There Marengo took on a character in which she could be the bad or the good, and after eliminating Melina Figueroa she managed to reach the final but failed to beat Stephanie Cuevas, staying in second place.