User blog comment:Darkcloud1111/Camp Half-Blood Series General Discussion/@comment-5173253-20131001023140/@comment-3146930-20131004222830

Wait, you're right; my mistake. Anyway, I think her choice was to allow Percy to kill Luke. Annabeth was the one that told Percy what the cursed blade was and broke through to Luke, allowing Luke to kill himself. She chose to let Luke die. This is somewhat supported by Pan's line "You will play a great role, though it may not be the role you imagined."