She was educated at Monk's Walk School, Welwyn Garden City, Hertfordshire. Dixon's parents separated when she was four and her father moved away, resulting in her later describing her family life as "very dysfunctional". Between the ages of eight and ten, Dixon witnessed her mother suffer domestic violence from her partner; she only spoke publicly about the issue 21 years later, in 2010. Dixon created a documentary for the BBC, "Don't Hit My Mum", regarding the issue of domestic abuse from a child's perspective, and remarked upon her own childhood: "When I think about that time, I don't remember living in harmony, I don't remember any fun times, I suppose because the negativity has clouded it. The negative times and the scary times have blocked anything that was good ... I believe that every child has the right to grow up in an environment where they feel secure and fearless going into the world, and I didn't really feel that".