Mariam Mohammed-Isa, a 15-year-old JSS 1 student from Chibok community has just escaped from Boko Haram bondage.

Yes, the story is true but you must have been wondering how her profile fits with that of the 219 'Chibok Girls' who were said to be writing their final secondary school exams when they were abducted.

The Nigerian government has now retracted its announcement that another Chibok girl was free, saying she was not one of the 219.

The Senior Special Assistant to the Acting President on Media Publicity, Laolu Akande, tweeted on Wednesday night to confirm the identity and profile of the returnee girl.

Then in a text message to AFP on Thursday, he said the 15-year-old was "not part of the 219".

READ: ANOTHER CHIBOK GIRL HAS ESCAPED

In Nigeria’s education system, Mariam Mohammed-Isa being in her first year of Junior Secondary School (JSS1) when she was abducted was five-year junior to the famous Chibok girls who were in their final year of Senior Secondary School (SSS3).

The #BringBackOurGirls group, which has been campaigning for the release of the Chibok girls, also said the girl's name was not in their records.

"We've perused our list but can't find the name of the returnee said to be 1 of our #ChibokGirls," it said on its Twitter account.

"Whether 1 of our missing #ChibokGirls or not, we are excited over everyone who regains their freedom & we look forward to all returning."

Boko Haram kidnapped 276 students from the Government Girls Secondary School in the remote town in Borno state on the evening of April 14, 2014.

Fifty-seven escaped in the hours that followed but 219 were not so lucky.

Since then, 106 girls have been found, rescued or released, including 82 who were freed earlier in May through a prisoner swap deal for a number of Boko Haram suspects in custody.