What really happened on May 26, police said, is that Randolph's 2-year-old daughter refused to get out of the vehicle.
The children's mother, Cynthia Marie Randolph, was arrested Friday in Parker County, TX, and faces two felony charges of causing serious injury to a child.
At first, authorities say that the suspect told them that she was folding laundry while her children were outside playing.More news: YouTube sees 1.5 bln logged in viewers per month
But she later confessed she had found the children playing in the vehicle, parked outside their house, and when her daughter refused to exit she shut the door to teach her a lesson.
Randolph then when back into the home, smoked marijuana and slept for two to three hours, according to FOX4.
The sheriff's office was alerted to the incident around 4 p.m., when temperatures outside had reached 96 degrees. The children died on May 26, 2017, according to a Parker County sheriff's news release. When she didn't hear from them for almost half an hour, Randolph said she searched for the toddlers before discovering them locked inside the vehicle, alongside her keys and cellphone. From 1990 to 2015, 755 children died after being left in hot cars.More news: Fed: Biggest US banks strong enough to withstand recession
Authorities later determined that the children died from extreme heat exposure.
She claimed they were in the auto for no more than an hour. Authorities note that Randolph "created several variations of the events" over the course of the last month. She quickly broke the window and called for medical attention but it was already too late because both children were pronounced dead at the scene. Initially, the mother told cops that she was doing chores in the house when the children "took off".
Randolph confessed to breaking the windows to make it look as though the kids had been locked in by accident. A bond had not been set and it wasn't immediately clear whether she retained an attorney, NBC Dallas-Fort Worth reported.More news: List of Congress members found in pocket of suspected congressional shooter