Kalifa was first introduced as being Iceberg's attendant at Water 7, when in reality, for the 5 years she had been working with Iceberg, she was a spy working as a CP9 member that was tasked with finding the blueprints regarding Pluton.
Taking advantage of Sanji's chivalry, Kalifa easily defeated him, but was later beaten by Nami.

She escaped Enies Lobby alongside the rest of CP9, but her current whereabouts are unknown.
Awa Awa no Mi (Bubble-Bubble Fruit): Kalifa has the power to create bubble