After Duff fulfilled her 65 episode contract with Lizzie McGuire, Disney considered continuing the franchise further, through films and a prime-time television series to be broadcast on ABC. However, the plans failed because Duff's representatives said she was not being paid enough for the proposed series. Duff also starred in the Disney Channel television film Cadet Kelly (2002), which became the network's most watched program in its 19-year history. In the movie, she plays a free-spirited girl who is enrolled in a military school and finds it hard to adjust to its strict and disciplined environment.

source:en.wikipedia.org