"It's unfathomable on so many levels. For one, that it actually happened. For two, where it happened. For three, how often something happened," the mother said in an exclusive interview with Eyewitness News.
The woman, who asked to be identified only as Jane Doe, said her 5-year-old daughter was caught by a teacher inside a bathroom at school giving oral sex to a 4-year-old boy.
"I said, 'Where did you see this? How did you know that this was something to do? 'She said, 'I saw another little girl do it.' I said, 'Well, where?' 'Here at school.' 'When?' 'During nap time,'" the mother recalled.
Jane said investigators found no evidence of child abuse at her home. She provided us documents from the County of Los Angeles Department of Children and Family Services showing the case was closed as inconclusive.
The First Lutheran Church of Carson School was cited by the California Department of Social Services for a sexual incident between kids. Jane's daughter said it wasn't an isolated incident.
"The way that she explained it, it was kind of like it was an everyday thing...from pulling the pants down to exposing themselves to, you know, trying to get somebody to put their mouth on the privates," said Jane.
Eyewitness News first broke this story on Friday when Richard McCarthy told us exclusively that his son often received oral sex at the school.
"It went down in the classroom, it went down in the bathroom, and it went down out on the playground," said McCarthy.
After seeing that story, attorney Greg Owens said more people started asking to join his lawsuit against the school and the church, so he is no longer planning to file it Monday. He is going to wait.
The Los Angeles County Sheriff's Department's Carson Station says the story is prompting it to ask questions of various state agencies to see if any crimes were committed.
The school itself is set to close on Friday. School officials still haven't gone on camera, but told me off camera that they believe there were only two incidents involving inappropriate touching among the kids.
They said the school is closing because the director is leaving for personal reasons and no teacher wants the job. They insist student sex has nothing to do with the closure.
"I think they definitely tried to cover up the incidents," said Jane.
Jane pulled her daughter out of the school in October. She said her daughter is in public school now and doing better. As for Jane, the reality is still tough.
"As a mother, I tend to blame myself, thinking what if I had just asked the question, what if I could have found out somehow that this is going on," she said.