Although Katniss has already contemplated killing Johanna and Finnick, for petty or calculated reasons, Collins now shows Katniss to be motivated above all else by her love for Peeta. Thus, she’s planning to kill Enobaria not because she wants to win the Game or because she’s jealous of the other players, but because doing so would give her loved one the best chance of being sole champion. This points to Katniss’s maturity and selflessness, but also her growing affection for Peeta.