The Question and Answer section for Mockingjay is a great resource to ask questions, find answers, and discuss the novel.
That would be the Capitol children.
She tries to protect them because the children are innocent.
Coin wanted to gain all of the power for herself and was responsible for sending the parachutes responsible for Prim's death. When Katniss realizes that Snow is not lying to her about the parachutes, she understands that Coin was..... thus, she...