Holding on to things.

I recently got into a fight with a friend and we talked it out immediately cause thats what I like to do. Unless it is a huge fight then I like to have time to calm down before I say things out of anger. So we each spoke our sides and responded. And agreed we were over it. It was a tiny fight about just simply respecting each other's stuff. and we were good... or so I thought. She just doesn't let things go. She brought it all up again yesterday, I restated my argument and she was like ok we are chill... but she said it before... And I am stuck wondering if she is just being oversensitive or drama hungry. She acted like she was the victim when it was my stuff that was stolen and it was her friends that did it. People should just be able to move on better.