I think that the books are much better than the movies, but I beleive the movies on this one. Idk about the books, but in the movie at Weasley's Wizarding Wheezes, it shows Ginny and Hermione picking up love potions. Hermione sets her down before they leave, but it doesn't show Ginny setting hers down.... It is entirely possible that she did, and the film didn't show it, though. The other reason I believe she did, is when Ron, Hermione, Ginny, Tonks, Lupin, Harry, Arthur, and Molly are at the Burrow, is that Charistmas? You know, the scene wjere the burrow burns down? Yeah, that scene. Harry, Ron, and Ginny, (is Hermione there?) are sitting on the couch when Ginny gives Harry a piece of candy. Ginny then sets the tray down, and no one else touches it. Not too far after, Harry (well, almost) kisses Ginny. Suspicious, huh?