Samina Malik, who burst into tears on hearing the verdict, wrote poems entitled How To Behead and The Living Martyrs and stocked a "library" of documents useful to terrorists.

On the social networking site Hi5 she listed her interests as: "Helping the mujaheddin in any way which I can ... I am well known as lyrical terrorist."

The jury at the Old Bailey found Malik guilty by a majority of 10 to one of possessing records likely to be used for terrorism.

Judge Peter Beaumont, the Recorder of London, bailed Malik on "house arrest" and ordered reports into her family background ahead of the sentencing on December 6, warning her that jail remained a possibility.

"You have been, in many respects, a complete enigma to me," he told her.

Malik, who worked at WH Smith at the airport, was arrested in October last year. When her bedroom was searched police found a ringbinder full of documents as well as a bracelet bearing the word "jihad".

There was also a sticker on a mirror inside the door, bearing the words "lyrical terrorist".

In one handwritten document found by police, she wrote: "I want to have the death of a shaheed [martyr] ... I want the opportunity to take part in the blessed sacred duty of jihad."

Also found were publications from an Islamist extremist group called Followers of Ahl us-Sunnah Wal-Jammaa'ah, linked to another group, The Saved Sect, and to the extremist cleric Sheikh Omar Bakri.

In a box file in the family lounge was a printed version of the "declaration of war" by Osama bin Laden.

One of Malik's poems, entitled The Living Martyrs, said: "Let us make Jihad/ Move to the front line/ To chop chop head of kuffar swine".

A second poem was called How to Behead. "It's not as messy or as hard as some may think/ It's all about the flow of the wrist," it read.

The Mujaheddin Poisoner's Handbook, Encyclopaedia Jihad, How To Win In Hand To Hand Combat, and How To Make Bombs and Sniper Manual were found on her computer.

The court heard Malik joined an extremist organisation called Jihad Way, set up explicitly to disseminate terrorist propaganda and support for al Qaida.

Jonathan Sharp, prosecuting, said she was an "unlikely" but "committed" Islamic extremist: "She had a library of material that she had collected for terrorist purposes. That collection would be extremely useful for someone planning terrorist activity."

But Malik, of Townsend Road, Southall, west London, told the jury: "I am not a terrorist." She claimed to have used the nickname "lyrical terrorist" because she thought it was "cool".

Malik was convicted of possessing records likely to be useful in terrorism under the Terrorism Act 2000. She was earlier cleared by a jury of a separate count of possessing an article for terrorism.