You are right. Let’s turn her loose.
This woman most certainly does not know Jesus Christ. I do know Him, yet I have still sinned, even today. By word, by action, by act, or failure to act. Sin is in me. I am not fallen because I sin - I sin because I am fallen, with the rest of humanity. That is why Christ came, lived, and died.
I make a lot of arguments here on the forum about what is wrong - and I base most of that on the Bible. But this particular case is tragic. A little child was killed. His mother is lost, and now must deal with it.
I take no pleasure in it, nor will I.
I find it interesting that we are quick to find righteousness in ourselves in the parts of our lives we have it, but quick to find condemnation in others.
As Dr. Ravi Zacharias once said (I am paraphrasing):
....the drunk takes consolation in his charity, and the adulterer in his modesty.....