Chocolate (2008)

A kung fu directed by Prachya Pinkaew, starring Yanin Vismistananda.
A mentally handicapped girl's mother used to be a gangster, but got in trouble and was kicked out of the racket. The mother gets cancer and the daughter gets good at muay thai kickboxing. When the daughter's friend finds an old account book with money owed to the mother, the daughter goes out to collect.
There is some good fighting in this film. Yanin has agility and grace, but lacks the power of Tony Jaa. The warehouse fight and the butcher shop fight are pretty good, there's a short kung fu savant vs. kung fu savant fight, but the real action is the end fight. I don't want to spoil it because it's really cool. I'm rating this awesome and getting Yanin's other film, Raging Phoenix (2009).