"If you can recall where she lives, we'd be glad to pay her a little visit." A girl with etheric vision and some kind of ability to interact with spirits, eh? It sounded like she would be an invaluable resource, even outside of this case.
"Now, what's gonna happen here is Liz here is gonna take some readings and I'm gonna ask you some questions. I don't want to be morbid or anything, but could you describe for me the sensations you experienced when you died, and while you were dead, and when you came back to life?"