Jo Frost goes head-to-head with a seven-year-old girl who holds her whole family to ransom. Can Mum overcome the fear of her own daughter? Or will her little rebel reign supreme? Wendy Agate is struggling to bring up her three girls: 10-year-old Marie, nine-year-old Amie and seven-year-old Maryann; largely because of her youngest daughter's shockingly bad behaviour. She calls her mother a 'fat bitch', attacks her sisters, runs out of the house and across the road, and keeps everyone awake at night with screaming fits. Supernanny confronts Wendy, and then spells out how things are going to change: a reflection room for when the girls misbehave, a trust technique to allow the girls to go out to play safely, and a video diary room where the girls can express their feelings without blowing their top. Things start to improve - until Maryann uses the video to tell mum what she really thinks of her...