She saw the girls in the
north-eastern Gwoza town before the Boko Haram militants were driven out of
there by regional forces.
Boko Haram sparked global
outrage when it seized more than 219 girls from Chibok town a year ago.
The US, China and other
foreign powers promised to help find the girls.
However, the girls have
never been traced, and little has been heard of them since they were taken from
their boarding school.
The Nigerian woman, who
lived under Boko Haram's rule in Gwoza, told the BBC she saw the girls in
Islamic attire, being escorted by the militants.
"They said they were Chibok girls kept in a big house," said the woman, who asked not to be identified for fear of reprisals.
"We just happened to be on the same road with them," she added.
Three other women also told the BBC they had seen the girls in Gwoza.
Another woman told the BBC she last saw some of the girls in November at a Boko Haram camp in Bita village, also in the north-east.
"About a week after they were brought to the camp, one of us peeked through a window and asked: 'Are you really the Chibok girls?' and they said: 'Yes'. We believed them and didn't ask them again," the woman said.
"They took Koranic lessons, cleaned their compound, cooked for themselves and they braided each others' hair. They were treated differently - their food [was] better and water clean. "
"They said they were Chibok girls kept in a big house," said the woman, who asked not to be identified for fear of reprisals.
"We just happened to be on the same road with them," she added.
Three other women also told the BBC they had seen the girls in Gwoza.
Another woman told the BBC she last saw some of the girls in November at a Boko Haram camp in Bita village, also in the north-east.
"About a week after they were brought to the camp, one of us peeked through a window and asked: 'Are you really the Chibok girls?' and they said: 'Yes'. We believed them and didn't ask them again," the woman said.
"They took Koranic lessons, cleaned their compound, cooked for themselves and they braided each others' hair. They were treated differently - their food [was] better and water clean. "
credit:BBC