The win saw the Falcons book their place into the ssemi-finals of the tournament.
Ajibade opened the scoring in the 19th minute and got on the score sheet again in the 30th minute.
And in the 34th minute, Ajibade completed her hat-trick to make it 3-0 in favour of the Falcons.
In their opening game on Thursday against Mali, who replaced Benin Republic, the Falcons won 1-0.
They will round off their Group B games on Monday when they face Togo.