Coronado's three daughters, a 3-year-old, a 2-year-old, and 2-month-old, were in bed with her. They were covered in blood and pronounced dead on the scene by law enforcement.
When law enforcement officials arrived at the home, they were met by family members who told deputies that a mother had killed her children, according to a news release from the Los Angeles County Sheriff’s Department.
Coronado was arrested on suspicion of murder and taken to a hospital for examination.
Coronado was first discovered in bed by her mother, who had come over to visit with her granddaughters.
The girls' father was also home when deputies arrived.
Several knives were recovered from the home, but the sheriff's office told local reporters that there could be multiple causes of death.
Ryan Broderick is a senior reporter for BuzzFeed News and is based in New York City.