An Indiana woman who plowed her pickup truck into four children, killing three of them, as they crossed a two-lane highway to board their school bus has reportedly been sentenced to at least three years in prison.

Alyssa Shepherd, of Rochester, Indiana, was sentenced to one year in prison, one year of house arrest and one year of probation for each of the three counts of reckless homicide she was convicted of, according to NBC affiliate WNDU. She could face additional prison time for two remaining charges, including criminal recklessness and passing a school bus causing injury with a stop arm extended, the station reports.

Shepherd pleaded not guilty in the Oct. 30, 2018 crash, but was convicted in October. She faced up to 21 ½ years in prison at her sentencing.

The mother of three children who died while crossing a busy street to get to their school bus had complained to her kids’ school district about the hazard years before her children were tragically killed, her friend and neighbor tells NBC 5’s Natalie Martinez.

Authorities said Shepherd was driving a pickup truck at around 7:30 a.m. when she struck four children who were crossing a two-lane road to board a Tippecanoe Valley School Corp. bus near Rochester, about 100 miles north of Indianapolis.

Six-year-old twin brothers Xzavier and Mason Ingle, and their 9-year-old sister, Alivia Stahl, were killed. An 11-year-old boy was severely injured in the crash.

At the time of her arrest, Shepherd told authorities she didn’t realize that she was approaching a school bus, despite the activated stop arm and flashing lights. Court documents show Shepherd told police she saw the lights but didn’t recognize the vehicle as a school bus until the children were right in front of her.

Shepherd took the witness stand during her trial and under questioning by defense attorney Michael Tuszynski she remembered seeing blinking lights and something that appeared to be a large vehicle. But she said she didn’t see a bus, nor did she see the red sign telling her to stop. She described emotions ranging from disbelief to hysteria after realizing she had struck the children.

“The only way I can describe it is an out-of-body experience,” Shepherd said. “I was a mess.”

In closing arguments, Fulton County Prosecutor Michael Marrs said the bus stop had been in place for 50 years without a child being killed. Marrs also reminded the jury of testimony from a driver who was behind Shepherd who said she could tell there was a school bus with its warning lights on and stop arm extended.

“The thing that makes me sick here is that this never should have happened,” Marrs said.

A 24-year-old woman has been charged in the deaths of three children who were struck and killed Tuesday morning at a school bus stop in Indiana, police said. Natalie Martinez reports.

Tuszynski argued Shepherd’s actions did not meet the definition of reckless. He said for her actions to be reckless, she would have had to know it was a stopped bus with children boarding and just not care.

The crash led to statewide changes, prompting the Legislature to increase penalties for drivers who illegally pass stopped school buses.