It wasn't so much faith in him as her unwillingness, perhaps even inability to really deal with Peeta being this changed. He was what he was, and her mind wasn't willing to make room for these changes. When they were undeniable, then she just flipped a switch to him being... different.

But she couldn't believe he would not get better. Because if he couldn't, she had no hope.

"No one would hurt them." She finally agreed softly.