This girl started drama with me?HELP?

Omg im not gonna say names but okay here goes. This girl _____ has had something against me since we met. which was like in the 7th grade,were now in 9th grade. anyway she messaged me on myspace saying i said stuff about her hair. this has happened a couple times before but ive blowed it off. but a couple days ago she said this on myspace" real talk you need to stop sayin **** about my hair cuz you die your hair hella more then i do". or something like that. i responded like i should but should i fight her?