They had been at a club/bar nearby. They were tossed from it for arguing/fighting. As I understand it, they left the club and the fight continued, she then wanted to continue to party at the track (IMO). Some locals like to ride around in the area (not me, lol) and meet up with their friends to party. There are lots of partying/riding around/walking around, going on all night long there and about the track and campground areas, etc. I don't believe she had a ticket to the race and I don't believe her belt buckle was made of diamonds as it's being reported by media. Hope that clears some things up.
ETA I wish this thread was private, I don't want to be contacted by any of the authorities and I definately want to remain anonymous.