The 22-year-old became the 250
th former guerilla fighter to be killed in Colombia since the signing of the 2016 peace accord designed to end the decades-old conflict.
She was reportedly leaving a party with her younger sister, Reina Zabala Mazo, in the early hours of the morning when unknown assailants opened fire, killing the pair.
Ms Mazo was known by the nom de guerre Liliana Estrada during the conflict.
She was part of the ranks which demobilised following an agreement that saw Farc lay down its arms and become a legal political party, the Alternative Revolutionary Force for the Common People also known as Farc.