How does Katniss show her shift from focusing only on her own survival to viewing the Capitol as the real enemy

I think the moment she lays flowers on rue is where this shift takes place. There is now a greater cause that Katniss has entered into than merely her survival. Katniss makes sure that her display of grief over Rue carries a subtext of rebellion against the people she really holds responsible for Rue's murder. She now makes it clear that the Capitol and President Snow are her real enemies.