Conversation so far:
How did Kim Chiu's career begin?
Chiu gained prominence by winning the reality series Pinoy Big Brother: Teen Edition.
What did she do after Big Brother?
After winning, Chiu became part of Star Magic.
what is Star Magic?
CANNOTANSWER.
what was her next big break?
She and her on-screen partner Gerald Anderson became regulars in ASAP XV.
what was her role there?
appeared together in several ABS-CBN shows Love Spell, comedy sitcom Aalog-Alog and in the film First Day High.
what was her biggest success at this time?
she was nominated and eventually won the 38th Guillermo Mendoza Box Office Awards.

Question: what did she win the award for?
Self-contained rewrite: what did Kim Chiu win the 38th Guillermo Mondoza Box Office award for?