To make Cho tell her where the Dumbledore's Army meetings were held and who was involved, Umbridge forced Cho to drink Veritaserum, which forces the consumer to tell the truth.
(But only in the films, which have nothing to do with the books)
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In the book she didn't. It was Marietta Edgecombe. In the movie however it was Cho. At one point Harry tells Cho that he heard Umbridge gave her a hard way to go. Later, when Harry is caught by Umbridge and the Inquisitorial Squad, Umbridge calls Snape into her office. She demands that he bring her more Veritaserum (a truth serum). Snape advises her that she used the last of the serum on Miss Chang.
Her real name is Cho Chang. The actress who played her is called Katie Leung.
Nobody killed Cho Chang, she survived the series. Cho later married an unnamed muggle man.
She is from Japan.
Yes she is.