If she did infact do something, which appears to be the case, she should take this opportunity to sing like a canary.
Spare her family even more pain. Help LE in locating the remains, or this baby (doubtfully with us today) and giving her parents, extended family and the world peace.
However, if she still insists that she's innocent, she should still come forward with all she knows... and be TRUTHFUL this time. I know - what a concept.
KC it's time to sing girl... can only go up from here. The one thing you have to lose now is your OWN life.