Iya Gana, whose husband was killed in the attack Thursday night, said the rebels entered her village and killed her husband and others.
She said they burned down homes and stole vehicles and cattle after killing people in two villages near Mora, in Cameroon's Far North province, about 20 kilometers from the border with Nigeria.
Boko Haram extremists have been crossing into and attacking towns in neighboring countries, including Cameroon, that contribute to a regional military force trying to eliminate the insurgency.