Valessa Robinson, 30, was released from a state prison in Florida City in southern Florida after serving 15 years of a 20-year sentence, WTSP-TV, Tampa, reported.
Robinson was 15 years old when she and her boyfriend, Adam Davis, killed her mother, Vicki Robinson, in the upscale northern Tampa suburb of Carrollwood in 1998.
Valessa Robinson was convicted of third-degree murder. Davis received the death penalty.
Prison officials said during Robinson's time in prison she got her GED, trained animals, developed an interest in nutrition and taught aerobics.
She will reportedly be staying with her father in Ocean Springs, Miss.
Davis remains on death row.
A friend of Davis, Jon Whispel, who was convicted of second-degree murder in Vicki Robinson's death, was sentenced to 25 years in prison and is scheduled to be released in 2020, TBO.com reported.