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Shakil posed a "real threat" on her return to the UK, police say.

Counter terrorism officers said Tareena Shakil was "not naive" and had "clear intentions" when she travelled to Syria. 

It took the jury of six men and six women nine hours and 35 minutes to reach their decision, and when they did it was unanimous. 

Judge Melbourne Inman QC told Tareena Shakil - who looked stunned by the verdicts - that she would be sentenced on Monday. 

The Recorder of Birmingham said: "You may go down and be remanded in custody until Monday's sentence."

BBC News England

In taking her young son to Syria, the NSPCC said she was "potentially exposing him to harm and even death"

A spokesperson for the charity said it was "inconceivable" a mother would be willing to put her toddler in such a position. 

Shakil had claimed she feared eternal damnation if she did not make the journey,

In a conversation with her father on WhatsApp, in mid-December 2014 while living under IS rule, she told him: "I want to die here as a martyr." She later claimed these messages were sent under duress by female Islamic State minders. 

Birmingham Crown Court heard Tareena Shakil had changed the status of her Facebook page, emblazoned with the black flag of IS, to read: "If you don't like the current events in Sham (Syria) take to arms and not the keyboard." 

However, when asked in court if she ever intended to encourage acts of terror, she replied "Not at all".

Tareena Shakil gave her account of what happened in Syria to police during an interview, after she'd been arrested by counter-terrorism officers at Heathrow.

Tareena Shakil took media studies, film studies and psychology at Burton College and went on to Wolverhampton University to do a degree in counselling psychology. 

However, she had met her boyfriend on a night out clubbing on Birmingham's Broad Street and in 2011 they were married.

During her evidence to the trial, she spoke of the troubled relationship. "Yes, there was violence," she said. She added: "It was very much fuelled by alcohol and drink, pretty much straight away, after moving in together it deteriorated." 

According to friends, Tareena Shakil had showed little active interest in Middle East politics when growing up in Burton-upon-Trent - she had once bought nappies for a Syrian refugee aid drive.

Close friend Ruksana Bibi said Shakil did "normal girly stuff" while another former colleague Sarah Swami described her as "fiercely loyal, head-strong - but in a good way and very family orientated".

In Burton she had once worked part-time jobs at Morrisons and New Look.

Allen Cook
BBC Local Live

During her trial, the jury was shown her tweets, messages and photographs, including images of the black flag of IS and passages calling on people to "take up arms".  

She had also stated her wish to become a "martyr".

Shakil posed her son for pictures wearing an IS-branded balaclava after secretly running away to Syria in October 2014. She told the court it was because he "loved hats".

Phil Mackie
Midlands correspondent, BBC News

Tareena Shakil was radicalised after she moved to Birmingham, soon after her young son was born and her marriage began to break down. 

She was groomed by an extremist on Facebook.

The court heard heard that before going to Syria, Shakil had chatted online with "prominent IS member" Fabio Pocas.

She was also in touch with Sally Ann Jones, the British widow of Birmingham jihadi Junaid Hussain who was killed in a drone strike in Syria last year.

There were further signs of growing radicalisation, including searches for videos of an extremist who was killed in a US drone strike in Yemen in 2011.

West Midlands Police's Assistant Chief Constable Marcus Beale, who leads on counter-terrorism across the region, said Tareena Shakil had "self-radicalised by viewing extremist material on the internet" before leaving the UK in October 2014.

“Our assessment is that she was not naïve; she had absolutely clear intentions when she left the UK, sending tweets encouraging the public to commit acts of terrorism here and then taking her young child to join Daesh in Syria," said Ass Ch Con Beale.

Dominic Casciani
Home Affairs Correspondent

Tareena Shakil was charged with "membership" of the self-styled Islamic State organisation - but she never had a membership card, says she deeply regrets going to Syria and, in a courtroom twist, told the jury she'd even been debriefed by MI5 on her return.  

Image source, West Midlands Police

So why did she face this very serious charge? Terrorism legislation basically says that membership of a banned group means to "belong".

Some organisations, such as Irish paramilitaries, had formal procedures for membership. With IS, men swear an oath, but the situation with women is less clear.

The jury were told to not think about membership in terms of belonging to a library or a gym. Instead, they had to decide whether Tareena Shakil voluntarily went to be with IS in Syria, knowing its aims, how it would achieve them and, crucially, seeking to associate with like-minded individuals.

Tareena Shakil, 26, was arrested by counter-terrorism officers when she returned to the UK on 18 February after landing at Heathrow Airport. 

Pictures from her mobile phone were shown the the jury during her trial.

West Midlands Police have described the guilty verdict of Tareena Shakil as an important conviction.

BBC News England

Relatives tried to convince Tareena Shakil to return home, telling her the terror group's leader was "doing murder" in Syria, Birmingham Crown Court heard.

Days after arriving in Syria, Shakil justified her decision to travel to there with her young son in a conversation with her brother-in-law - a hafiz, who had memorised the Koran. 

But he worked to convince Shakil she had made the wrong choice and urged her to return to her family in the UK. 

Speaking during her trial, Abou Bakker Oualkadi told jurors he had never considered Shakil to be a strict observer of the Muslim faith.

A Staffordshire mother who admitted she "made a mistake" taking her toddler son to Syria was a vulnerable victim of domestic violence left isolated by events in her own troubled life, the jury was told. 

Image source, West Midlands Police

Tareena Shakil was described as a highly intelligent young woman with eight GCSEs and three A levels, who ended up living in the heart of darkness in IS's de facto capital in northern Syria. 

The 26-year-old was convicted after a two-week trial at Birmingham Crown Court in which she explained her decision to flee the UK for Syria in October 2014 as a bid to leave a troubled family life behind.

BBC News England

When Tareena Shakil, 26, originally from Burton, was first arrested in February 2015 she told detectives that she had travelled to Turkey on holiday, where she said a man had kidnapped her and forced her to travel with her child to the Syrian city of Raqqa.

Birmingham Crown Court heard she told detectives that she had asked to be returned to Turkey, but was told it was "impossible".

Phil Mackie
Midlands correspondent, BBC News

A Staffordshire mother has become the first British woman to be convicted of joining so-called Islamic State (IS) after returning from the self-declared caliphate.

Image source, West Midlands Police

Shakil, 26, originally from Burton, posed her boy for pictures wearing an IS-branded balaclava after secretly running away to Syria in October 2014, Birmingham Crown Court heard. 

During the trial the jury was also shown photos of her posing with an assault rifle and a handgun.