Police are investigating an alleged incident of extreme bullying at a Perth primary school.

Amber, 11, alleges one of her peers tied a skipping rope around her neck and hung her from a tree at Queen of Apostles Catholic School in Riverton last Friday.

Amber, 11, alleges one of her peers tied a skipping rope around her neck and hung her from a tree at Queen of Apostles Catholic School in Riverton last Friday. (9news)

The school said it's talking to police over the incident. (9news)

Her mother, Belinda Yoon, told 9NEWS Amber’s toes were scraping the ground and she couldn’t breathe.

Ms Yoon feared her daughter, who has a rare heart defect, could have died if a teacher didn’t run over and free her.

"We have been having issues with Amber being bullied, causing major issues with anxiety," the mother said in a statement.

Amber suffers from a rare heart defect. (9news)

"Amber has been through more in her life, suffered more pain, and been in situations so terrifying most kids thankfully will never experience."

Ms Yoon said the school did not notify her at the time of the alleged incident or seek medical attention.

A spokesperson for Catholic Education WA told 9NEWS it is liaising with WA Police and “the school continues to consult with the families impacted”.

She has had multiple surgeries since she was young. (9news)