Farro’s launch to fame was in 2007 after being discovered by the Argentine theater producer Gerardo Sofovich in the Uruguayan capital, Montevideo. He signed Farro to his theater company for two years in which she performed in his comedy No somos santas and his musical comedy Le Referi Cornud. In 2008 she was cast by Sofovich to co-star in the magazine La Fiesta Está En El Lago alongside dancer Valeria Archimó and actress-dancer Adabel Guerrero, with all three writing. It was produced and directed by Sofovich, and also directed by René Bertrand.

In 2009 Farro was signed into Carmen Barbieri’s theater company and was the protagonist of two of her magazines, Fantástica in the 2009-10 theatrical season, and Bravísima in the 2010-11 season, both as the First Vedette. Farro decided not to sign for another year in the company, because she wasn’t pleased with some of her cast members, especially Uruguayan actress-dancer and fashion model, Andrea Ghidone and Greek-Argentine amateur glamour model and media-showbiz personality, Victoria Xipolitakis. Barbieri commented that she would have Farro back for the 2013-14 summer season at all cost.

Mónica had a special participation in El Musical de tus Sueños in 2009, dancing on doble stripper poles alongside Valeria Archimó, opening for the special edition re-entry gala (which Guerrero entered).

After four years of doing classical revue musicals, Farro was called in 2011 to lead and debut as a supervedette and as her own producer in an alternative revue show mixed with musical comedy with Negro Álvarez touring all of Argentina and parts of Uruguay.

On November 2, 2012 the actress made an appearance for the river border state of Argentina to Uruguay, Entre Ríos Province in the Astros theater, where she and many other theater artists presented Entre Ríos’ summer theatrical season debut for 2012 and 2013 with three shows. She starred as the lead actress in one of these, the theater comedy La noche de las pistolas frías.

On January 4, 2013, La noche de las pistolas frías debuted in El Gran Teatro Colón in Entre Ríos, with Farro alongside Emilio Disi, Martín “Campi” Campilongo, Claudia Ciardone, Florencia “Flopy” Tesouro, Manuel Navarrete, Cristina Alberó and Luly Drozdek.