I NEED BIG TIME ADVICE ON THIS #####? (FRIEND)?

Okay so i use to be like a huge b%&*$# but recently i decided to change my ways and be nice and stay out of drama...so me and my best friend got into a argument because she's a lier and she been inboxin me on myspace (i blocked her on facebook) talking ****. i've been trying to be nice but honestly she starting to piss me off. and im thinking about EXPOSING her. BUT she does know things about me but nothing i would care about getting out. I know i can kick her *** so it bothers me that she thinks she tough....EXPOSE her or NO?