Do not open that file, just in case.
I dunno, any buyer that opened with the fact it is too expensive is not worth that much of your time. I bet it's some sob story...and also bet we aren't talking coming in 10% under either. More like half at best.
She may be legit and have good intentions but I still, as a seller, see no reason for you to get their backstory-let them come look and make an offer without all the drama.