Book Haram: a mystery to common sense

I'm sure some of us have come across this particular story of Miriam on in the news lately. Miriam was a Boko Haram abductee who escaped from the camp and told her story to a BBC reporter.
Something in her tale made me begin to reconsider my confidence in security forces fighting the terrorists.
Miriam's story goes like this when put briefly. She is 17. She was taken from her village six months ago when Boko Haram took over her village. She escaped six months latter and returned to her same village where her people live without Boko Haram oppression which means that government forces have taken her village back. She is heavily pregnant. She was held in a small room along with about forty other women and girls.
These are what were gathered from her story as reported by the BBC.
Now these are what I would deduce from her story. There are other girls and women still in captivity in that same place she escaped from. The town where she was held would not be too far from her village which is now under government forces. A heavily pregnant 17 year old won't be able to run a very far distance without being caught up with by her captors.
Now here is my question. How can the Boko Haram have a base in a runable distance from government forces and yet not found in all those six months?
What has security forces done with any Intel she can share to rescue the other women.
This raises question over the sincerity to the fight against Boko Haram and the competence of these forces.
This is an embarrassment to common will.