Facebook minefield

So I'm ridiculously torn about how to respond to this - I got a Facebook friend request from someone I feuded with in high school.  I mean, this girl and I hated each other.  We almost got into a fist fight one day (over what, I have no idea - I have no recollection about why we hated each other.  I don't think there really was a reason, it was just one of those things.)  We were never friends in "real life" - should we be FB friends???  Is it weirder for her to send me a friend request, or for me, as an adult, 30 years later, to wonder if I should accept?