(CNN)The relentless bullying became too much to handle for an 11-year-old girl with a "crooked" smile, her mother said.
At 3 years old, Bethany Thompson was diagnosed with a brain tumor and battled through radiation treatments. Though cancer-free since 2008, treatment caused nerve damage that changed Bethany's smile. That, and her curly hair, led to bullying, said Bethany's mother, Wendy Feucht.
Feucht said after a particularly tough Wednesday with bullies, Bethany told her best friend she couldn't take it anymore, and was going to take her own life.
The Cable, Ohio, sixth grader killed herself that afternoon, October 19.
Her friend's father called Bethany's mom, but it was too late. Bethany found a gun kept in the house, and shot herself one time, police said.
Her stepfather was asleep in another room.
Feucht said Bethany would have had to go searching for a weapon, as she and her husband never told their children where they were and kept the guns out of sight.
"There's a piece missing, I've had this constant in my life for 12 years and now it's gone," Feucht said. "Nothing's going to be able to fill that hole."
"She was my princess, that's my baby girl. Life revolved around her for me," said Bethany's dad, Paul Thompson.
Champaign County Sheriff said they're treating the death as an apparent suicide.
Her family and friends remember Bethany as generous and loving, and full of life. She loved swimming and animals and listening to music.
School investigated the problem
Triad Middle School was aware of the bullying problem, Feucht said. She had talked to the principal as recently as the Monday before Bethany's death. The principal told her he was investigating, Fuecht said.
"Something has to change, something is broken in the system and there are lots of different ways that this could have been handled," she said.
In hindsight, Fuecht said she didn't get mad enough; to parents she said, "Call them, call them every day if you have to and eventually they'll be tired of hearing from you and actually do something."
Triad School District Superintendent Chris Piper confirmed the school was aware of the bullying.
"Last school year, district officials investigated a complaint raised by the student and appropriately resolved the same. As many school districts across the country are currently doing, the Triad Local School District is undertaking efforts to bolster anti-harassment and bullying training for both students and staff," Piper said in a statement."
Bethany studied in the Triad school system her whole life, so while her family considered transferring Bethany, her mom thought it safer to stay in a school where everyone knew her story.
Bethany saw a counselor to help her find coping mechanisms and deal with her struggles with self-esteem, Fuecht said.
Having the support of friends wasn't enough to keep the bullying away, however, and some boys in her class were known to bully Bethany and others regularly, Feucht said.
Bethany and her friend went to administrators with anti-bullying posters on Bethany's last day at school, and were told they couldn't be used, Feucht said.
They made signs with anti-bullying slogans like "Buddies, not bullies," she said.