Born in Amichi, in Anambra State, as Nkiruka Peace Abuchukwu, she attended school in Onitsha.
[1][2] In 1998, Obiajulu was elected as deputy president-general of the Senior Staff Association of Utilities, Statutory Corporations and Government Companies (SSASCGOC), the first woman to serve on its national body.
She was also active in Union Network International, and worked closely with leaders of the Nigeria Labour Congress.
[4][5] In 2007, Obiajulu stood for re-election to the TUC presidency, but when it became apparent she would not be elected, she instead endorsed Peter Esele, who succeeded her.
[8] In her spare time, Obiajulu has been a Sunday school teacher at the Foursquare Gospel Church in Nigeria and a newspaper columnist.