Mfoniso Udofia’s nine-play Ufot Family Cycle forges on! The latest onstage installment, “Her Portmanteau,” hits Central Square Theater later this month. And it picks up a loose thread from the very first play  — the story of Iniabasi, matriarch Abasiama’s true eldest daughter. We speak with the playwright and the actress who portrays the daughter as part of our continuing coverage of the Ufot Family Cycle.