The defense attorney for 15-year-old Carly Gregg says their client deserves a new trial because she was previously treated for hearing voices using horse therapy.

In Sept., a jury in Rankin County, Mississippi, found Gregg, 15, guilty on all counts, and prosecutor Kathryn Newman said Gregg had shown “zero remorse.”

The teen was charged with murder and aggravated assault in the March 19 shooting that killed her mother, 40-year-old Ashley Smylie, and wounded her stepfather, Heath Smylie. She was also charged with tampering with evidence for hiding a security camera after the shooting.

On the first and second counts, Gregg was sentenced to life in prison. On the third count, she received 10 years.

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Now, Gregg’s defense said that the teen’s father revealed that she was “placed in equestrian therapy as a young child due to experiencing auditory hallucinations.”

“This new information supports Dr. Clark’s diagnosis of unspecified schizophrenic disorder and is likely to lead to a different result at a new trial,” the defense said. “As such, Carly is entitled to a new trial.”