Police have reportedly increased the teenager's security to that usually given to ministers and visiting political VIPs after spy chiefs warned of a raised threat to her life.
She was just 14 when she survived an assassination attempt after a bullet narrowly missed her brain as she was shot on a school bus by the Taliban in her native Pakistan.
The girls' education campaigner was flown to Queen Elizabeth Hospital in Birmingham, where she was treated for life-threatening injuries.
After her treatment, she was allowed to settle in the city - and last year she became the youngest person ever to win the Nobel Peace Prize.
A source told the Sun: 'Her life's been at risk since that failed murder attempt. But threats have grown significantly as her profile has become bigger.
'Being a Nobel winner and female education campaigner means she is seen as a global ambassador. Her elite police protection reflects this.'
Scotland Yard said it would not comment on matters of security or close protection.
On Thursday, she showed she is as intelligent as she is courageous - scoring a string of A*s and As in her GCSEs.
A message from her proud father Ziauddin Yousafzai on Twitter revealed his daughter's grades.
He wrote: 'My wife Toor Pekai and I are proud of Malala getting 6A*s and 4As. #education for every child.'
The grades included A*s in maths, biology, chemistry and physics, and As in history and geography.
She also got an A* in religious studies and a maths IGCSE, as well as As in English language and literature.
Edgbaston high school, the £3,878 per term in the senior school where she studied, had a GCSE pass rate of 98.3 per cent, with 28 per cent of pupils achieving nine or more A* grades.
In September the Pakistani military arrested ten men, all part of the Tehrik-i-Taliban Pakistan (TTP), for the attempted murder of Malala.
Pakistani officials said in April that all 10 men were found guilty of contributing to the 'planning and execution' of the assassination attempt against Malala and received a minimum prison sentence of 25 years.
But in June it emerged that only two of the suspects were actually convicted and jailed.
It is thought that the men who carried out the shooting fled to Afghanistan after the attack and evaded capture.
Malala was barely 11 years old when she began championing girls' education, speaking out in TV interviews.
The Taliban had overrun her home town of Mingora, terrorizing residents, threatening to blow up girls' schools, ordering teachers and students into the all-encompassing burqas.
Still campaigning, last month Malala called on world leaders to stop 'failing' the people of Syria.
The education activist described the situation in Syria as a 'heartbreaking tragedy', while speaking at the opening of a Malala Fund girls' school in neighbouring Lebanon.
'I am here on behalf of the 28 million children who are kept from the classroom because of armed conflict,' she said at the time.
'Their courage and dedication to continue their schooling in difficult conditions inspires people around the world and it is our duty to stand by them.
'On this day, I have a message for the leaders of this country, this region and the world - you are failing the Syrian people, especially Syria's children.