Young, foolish, and idealistic are no excuses for murder or attempted murder. If I read it right, she kicked a pregnant woman in the stomach, causing a miscarriage. She's not sorry she did these things, she's just sorry she got caught.
We were all young, foolish, and idealistic at one time. Not many of us robbed or killed anyone. Most of those that did paid for it, one way or another.
Judgement will come, for Sara, as it will for everyone. Vengence doesn't belong to us, but the right to keep people like Sara off the streets does.