The mother of West Hampstead schoolgirl, who killed herself jumping in front of a train, has called on providers that host suicide websites to do more to “stop poison spreading” by policing and removing unsuitable material.

Tallulah Wilson, who died in October 2012, was obsessed with online blogs about self-harm and suicide and in her own blog portrayed herself as a cocaine-taking anorexic posting pictures of self-harming scars.

Her mother Sarah Wilson warned other parents to be aware of the “dangers of the internet and what their children may be viewing online”.

She also called on large companies to refuse to advertise with websites that focus on suicide and self-harm “to stop this poison spreading”.

In a statement read out to media after an inquest into her death concluded this afternoon, Ms Wilson said: “Our lives will never be the same without Tallulah. We have lost someone more precious than words could ever say.

“A beautiful, loving, intelligent shining star has been stolen from our skies.

“Like any parent, I sought to protect my daughter seeking help from professionals at the school, the NHS, and the Tavistock Clinic.

“Her sisters and I did everything we could to keep her safe but she had fallen into a world of nightmares.

“She was in the clutches of a toxic digital world, where in the final few weeks we could no longer reach her.

“I was shocked by the ease with which Tallulah and other children could access online self-harm and suicide blogs.

“Tallulah entered a world where the lines between fantasy and reality became blurred, it is every parent’s worst nightmare.

“I believe websites, such as the likes of Tumblr, should do more to protect vulnerable young people from the insidious aspects of the internet. They need to take an active role in policing and swiftly removing unsuitable material as some sites already do.

“We appeal to big brands to withdraw their advertising from those sites that continue to focus on inappropriate self-harming and suicide promoting blogs to stop this poison spreading.

“My family has suffered an irretrievable loss and would now appreciate some time to reflect and come to terms with the world eclipsed without Tallulah, but every parent needs to be aware of the dangers of the internet and what their children may be viewing online.”