Jayda Sanchez, her 5-year-old brother and their father were leaving a park Friday night when a driver in front of them made an illegal U-turn in the 26000 block of South Vermont Avenue.
The father swerved to avoid a collision, causing the truck to rollover multiple times and crash into a light pole. Jayda died instantly. Her brother and father remained hospitalized Monday morning.
The children's mother, Adriana Rodriguez, on Saturday visited a memorial of candles and balloons set up near the crash scene.
Harbor City rollover crash: Mother demands justice after 4-year-old daughter killed, son injured
She said she can't believe her baby girl is gone. Born premature, she fought to survive only to have her young life cut short by a suspect who left her to die in the streets.
The Los Angeles Police Department said the driver of the other vehicle is still at large and a description of the fleeing vehicle was not immediately available.
"You know it was you, just come forward. You have to do the right thing. Give her justice," Rodriguez said.
A GoFundMe page has been set up to help Jayda's family.