Twin growth?

I had the twin growth today and found out that baby A did not grow much from last month's growth check. Baby A was 3lbs 6oz last visit and today she's 3lbs 10oz. Baby B was 3lbs 4oz and today he is 4lbs 14oz. The doctor said baby A doesn't have much blood flow through her umbilical cord and looks small for where they want her to be. The doctor said if baby A does not change by next week they will induce me and she might have to stay in the incubator or there's a chance she might not make it after delivery. Did any moms with twins have this problem and if so what happened?