Out of all the so-called near-death experiences, I have heard of only one who came back from Hell. It was a man, not a woman, so a different case from the one you mention. The details were never clear, but the gist of it was haunting. People kept asking him what it was like. They'd ask him, "Well, was it like this, or this?" But no matter what they asked, he replied, "No, worse than that. Much worse than that..."
As I recall, he prayed, and recited the 23rd Psalm. I always thought, once you're dead, it's too late for that. Maybe not.
I know there is still time for Terri's murderers to repent. I doubt it will happen.