A US mother’s post to a online group has led to her being slammed for cyber stalking a 12-year-old.

The woman was wrote to the group to reveal how she discovered that a young boy called Nick dating her 11-year-old daughter was previously a girl and now identifies as non-binary.

Taking to a Facebook group, she explained how actually she found out more about the non-binary child.

View photos A mother has led to her being slammed for cyber stalking a 12-year-old who was dating her daughter. Photo: Getty More

The post began with her explaining how she first began to believe her daughter -whom she says suffers from ODD (Oppositional Defiant Disorder) and ADHD (Attention Deficit Hyperactivity Disorder) – was being “deceived” by Nick.

“I chaperoned the 6th grade Halloween dance as this child was there. I knew she liked him but there is no PDA at school. She had her first slow dance. I just felt funny about the person.”

The mother decided to follow her “gut feeling” and went on to research and “find info” about Nick on Instagram.

View photos She shared a post to a Facebook group about how she discovered the child is non-binary. Photo: Facebook More

After she found an Instagram page where Nick did cosplay (wearing self-made costumes) and proceeded to go through every single post.

She continued: “This child posted a video of ‘the girl I Used to be’ I almost lost my sh*t!”

The mother confronted her daughter about her findings and said her daughter was adamant that Nick was a boy.

After watching the pair dance together at the school dance, the mum decided to message the boy. Nick replied and confirmed he was a girl but is non-binary and doesn’t identify with any sex.

View photos She revealed how she stalked the child on Instagram and sent messages via the socila media app. Photo: Facebook More

Nick said he didn’t mean to mislead her daughter and also confirmed that the pair kissed at the end of the school dance, which made the mother feel “nauseous and angry.”

While her daughter was “hurt and confused” by the revelation. The mum claimed her daughter “cried not because of what Nick says he is but because of misleading her.”

The mum went on to praise CBD oil for keeping her “calm” about the situation and stopping her from having a “nervous breakdown”.

View photos She then asked other for advice about how to stop rumour spreading about her daughter. Photo: Facebook More