Extremely guilty, as she did not help her when she saw her in the woods. The avox girl was presumably a run-away along with another boy, possibly her brother or boyfriend. She was captured and he was killed on site. She then had her tongue removed. Katniss apologises as much as she can without being obvious, as if the Capitol knew that she had seen the capture, she may be turned into an Avox as well.
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the first avox katniss encounters is a redhead that katniss saw in the forest with gale long ago. she and a boy behind her seemed to be running from someone. the people killed the boy and turned the girl into a avox.
She feels very sad... :(
Because Katniss thougt she could have saved her before the Capitol got her.
Why does Katniss feel so betrayed when Peeta asks to be coached separately
She doesn't like it but she goes to save Peeta's life