Barker had initially told police that she was attacked in a Lancaster Park on March 18 and her daughter Emma had been kidnapped. She later recanted her story and lead police to the child's body, hidden in tall grass. Barker told police she dumped the body after Emma died in an accident.
Barker was taken into custody and questioned, but was released a few days later.
As police continued their investigation, Barker was taken back into police custody and booked on suspicion of murder. Police said she had several inconsistencies in her story.
Barker's 21-year-old brother Nick Barker told the Associated Press that she was being represented by a public defender because the family can't afford an attorney for her.
Barker is being held on $1 million bail.
MORE LOCAL HEADLINES FROM LOS ANGELES
SEND TIP || REPORT TYPO || TWEET @abc7 || WIDGET