She was a major character in Rush Hour 2, but the character was written out of the third film. There's no explicit explanation given in the movie, but it's likely due to a combination of factors:
* Storyline Focus: Rush Hour 3 centered around the comedic duo of Chris Tucker and Jackie Chan, focusing on their adventure in Paris. Bringing back Jasmine might have diverted attention from the central dynamic.
* Character Arc: Jasmine's story arc in Rush Hour 2 had a satisfying conclusion, with her finding redemption and a new life. Bringing her back might have complicated this resolution.
* Actor Availability: Zhang Ziyi's career had taken off after Rush Hour 2, and she may have been unavailable for the filming of Rush Hour 3.
While she's not present in the third film, her absence is never explained or addressed, leaving it open to speculation from fans.