Reyer pleaded guilty to two counts of aggravated child abuse. She will receive credit for time served as she's been held at Limestone County jail for three years since the 2015 incident, the Daily Mail reports.
She told the court she did it to appease her former boyfriend Derrick Lynn Defoe, 33, who is still awaiting trial.
Defoe faces charges of aggravated child abuse, domestic violence and attempted murder for each child.
Reyer, who had diminished intelligence and an IQ of 76 or below, claimed to recently seeing a TV show where a child counselor recommended giving children a cold shower or bath as a punishment. So she tried the same tactic with warm water instead of cold.
She claimed that the family had just moved back into the mobile home after a while away and the temperature of the water heater was turned up, leading to the scalding temperature of the bath.
The water was so hot, it badly burned two-year-old Adriauna and five-year-old Cameron.
The scalding water peeled off Adriauna's skin and she suffered second and third degree burns over at least 70 percent of her body. Cameron suffered severe burns from the waist down.
Dr. Melissa Peters of the Children's Hospital of Alabama was on stand at Reyer's trial and said Adriauna went on a ventilator for respiratory failure and needed skin graft surgeries.
She described the little girl as looking like a "patchwork quilt" from the neckdown because of all the scars from the burns and surgeries.
Investigators found the hot water heater set at 150 degrees Fahrenheit and also found skin in various locations of the home.
Reyer said she pulled her kids out of the bath right away when she realized they were being scalded. She said she didn't intend to harm her kids, who both survived the abuse.
"Upon realising that the children were being scalded by the water, the mother immediately pulled the children out of the water and began determining the need for medical treatment for the children," her attorney wrote in a sentencing memorandum.
But experts say there is evidence that the girl was dipped into the hot tub at least twice and based off the injuries, the water could've been between 140 to 150 degrees Fahrenheit.
Reyer admitted she was negligent and that the guilty over her kids' injuries was something she will have to live forever.
The court heard that the children would have been in extreme pain and screaming.
"I am very sorry. If could do over, I would put myself headfirst in that bathtub before I let my babies get hurt," she testified.
There was also evidence of further child abuse including bruises and the fact both children's heads had been shaved.
Reyer had previously been arrested for leaving Cameron in a hot car at the Walmart in Athens. He was found and rescued by a Good Samaritan.
A year later, she left both Cameron and Adriauna in a hot car.
Limestone County District Attorney Brian C.T. Jones said: 'We're extremely pleased with the outcome of the case'.
"This is the kind of case that haunts people at night. A lot of the people involved and the children involved can know when they go to bed, that this woman is going to prison for the next 40 years," he added.
The daughter Adriauna is in the care of her paternal grandmother and son Cameron is in the care of a foster family who is working to adopt him. Both will deal with lifelong injuries following the incident.
