Without reading up too much on this, my thinking from what I know is that she wouldn't really be punished if she did face the law given that it seems to have been a genuine mistake, and she definitely wouldn't be facing any jail time - unless something has gone on that we aren't aware of i.e drink, drugs, phone, insurance. Correct me if I am wrong?
If I am right, her doing a runner and refusing to come back, and the US Government supporting this stance, seems very unnecessary and inappropriate. Must make a devastating time for the family so, so much worse.