Mags sacrificed herself for Peeta in The Hunger Games: Mockingjay because she believed it was the best way to protect him and ensure the rebellion's success.
Mags was a seasoned veteran of the Hunger Games, having participated in the Quarter Quell as a tribute from District 4. She understood the game's brutality and knew that Peeta was in danger.
Mags saw the potential for Peeta to be a symbol of hope and unity for the rebellion. His kind nature and ability to connect with people made him a valuable asset.
By sacrificing herself, Mags prevented Peeta from being forced to kill another child, which would have damaged his image and weakened the rebellion's cause.
In the book, Mags tells Peeta, "I'm not just protecting you, dear. I'm protecting the rebellion. You're their best hope. You're the one who can bring people together."
Mags' sacrifice was a selfless act that demonstrated her unwavering commitment to the rebellion and her belief in Peeta's potential. It was a powerful moment in the story that highlighted the sacrifices people were willing to make for a better future.