The mother accused gross vehicular manslaughter following the death of two children plead not guilty in court on Wednesday.
The 22-year-old was driving a Kia Sorento eastbound on Otay Lakes Road around 6 p.m. when she lost control near Wueste Road, veered off the side of the road and into the water, according to the California Highway Patrol.
There were three passengers: Her daughter, a 31-year-old male passenger and his daughter. Hernandez and the male passenger managed to escape the car, but the two girls drowned as they were trapped under water.
The judge ordered a $400,000 bail for Hernandez and she will appear in court on Aug. 16 for a readiness hearing.