How has Katniss' perspective change on the game and why?

After Rue's death, Katniss' song becomes genuine, not forced by awareness of the audience, and her flower decorations exhibit both her realizations about her identity and her burgeoning rebellion. In terms of the revolutionary theme, Katniss considers the flowers to be an act of individual rebellion against the Capitol. It can only hurt her chances in the arena, but she is asserting herself to be not controlled by them – in effect, understanding the meaning of Peeta's roof confession. Additionally, this episode illustrates Katniss's acceptance of her identity – she is a girl who values other people's dignity, and not just a competitor willing to accept their rules to survive.