Captain Harmony Chidi inspired Akeem Busari’s side, converting two first-half penalties to give Nigeria a commanding advantage at the break.
Oluebube Umejiaku made it 3-0 in the 67th minute before Oluwakemi Adegbuyi completed the rout with a fourth goal in the 90th minute.
The Flamingos finished the competition with a perfect record, winning all five matches while scoring 17 goals and conceding only twice.
Nigeria began with a 5-0 demolition of Niger Republic before beating Ghana 4-2. They followed that with consecutive 2-0 victories over Burkina Faso and hosts Cote d’Ivoire.
With the regional crown secured, Busari’s side will now shift focus to the 2026 FIFA U-17 Women’s World Cup in Morocco.
