"Primrose Everdeen!"
"I volunteer as tribute!"
From the second they called her name, she knew she was dead. She knew that her small body wouldn't be able to hurt a person bigger than her, especially in a hand to hand combat.
But when she called her brothers name, she knew that she would do whatever she could to protect him. Even if that meant killing everyone then killing herself so he could win.
"always and forever, Peeta. Never forget that"