Toms took up refereeing in the late 1980s, and progressed to become a reserve (now "fourth") official in the Football League in 1991 for the Bournemouth versus Reading match in the old Third Division, which was then unique for a female. She was the first woman to be included on the list of Football League assistant referees when she was chosen for the 1994-95 season, and became a referee in the Football Conference two seasons later, creating another precedent when she took charge of the game between Kidderminster and Nuneaton Borough her first Conference match as referee. Almost a year after that, she operated as an assistant referee in the Premier League, again, the first female ever to do so.