I'm scratching my head trying to think of what the FBI would be able to find out. She doesn't remember the date of the incident. She doesn't remember who hosted the party, where it was, or how she got there. She said she didn't tell anyone else about the incident. How exactly are they supposed to prove or disprove anything, and what exactly is there to scrutinize?
They would interview people asking if they remembered a party on a date they don't know, at a location they can't name, over thirty-five years ago? I can't even remember the name of my best friend in kindergarten, and that's someone I spent a good portion of every day with.
I think what I find most confusing is that many of the same people on this board that would eagerly, and rightly point out the problems with eye witness testimony even hours, days, or weeks after the event seem to have no issues at all with an account of an incident that occurred over thirty years ago.