Plot: 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