By Ed Payne, CNN
(CNN) - A transgender first-grader who was born a boy but identifies as a girl has won the right to use the girls' restroom at her Colorado school.
The Colorado Rights Division ruled in favor of Coy Mathis in her fight against the Fountain-Fort Carson School District.
Coy's parents had taken her case to the commission after the district said she could no longer use the girls' bathroom at Eagleside Elementary.
In issuing its decision, the state's rights division said keeping the ban in place "creates an environment that is objectively and subjectively hostile, intimidating or offensive."
Coy's mother, Kathryn Mathis, said she's thrilled that Coy can return to school and put this behind her.
The first-grader has been home-schooled during the proceedings
"Schools should not discriminate against their students," Mathis said. "All we ever wanted was for Coy's school to treat her the same as other little girls. We are extremely happy that she now will be treated equally."