Named as Ijeoma Franca Joseph, the suspect has been arrested in the Kuje Maximum Security Prison in the capital Abuja.
Authorities said the drugs suspected to be dagga were concealed in a carton of biscuits.
The biscuits were part of a parcel that included milk, clothes and N2 500 (over R88).
The illegal substance was discovered during a routine search on visitors, prompting the arrest of the suspect.
During the interrogation, the suspect expressed ignorance of the drugs or contents of the package, claiming she had been sent by one Mr Daniel to deliver the package to his imprisoned brother, named Miracle Amechi.
She has been handed over to the National Drug Law Enforcement Agency for further investigation.
Sylvester Nwakuche, the Federal Capital Territory (FCT) Controller of Prisons, warned visitors to prisons to shun smuggling drugs to inmates.
“The use of hard drugs does not only compromise reformation and rehabilitation of prisoners but also has debilitating effect on their health,” Nwakuche added.
The arrest of the woman coincides with the escape of 30 inmates from a prison in central Nigeria last weekend. A prison guard was killed during the jailbreak organised by some gunmen.
The inmates have since been re-arrested and a probe opened over the incident in Niger State.
– CAJ News