I hope she saw nothing too horrifying, but I suspect what she did or did not see could help. And I wouldn't be surprised if something comes up later that jogs her memory. I think little things like "do you remember going to the laundromat to wash clothes?", "Do you remember if you went to the gas station?", "Was Lonzie there with you in the car when you went there?","Did both of you go into the gas station?". She may have seen something way too terrifying to talk about, or she may have been threatened not to tell anyone. She may have seen nothing at all. But it might nail down a closer estimate to where and when Lonzie disappeared.