My friend keeps on bothering me ?

Ok, I have this friend whoI had an argument with, but we decided to take a break from each other. But now, she sends me a text every night asking me question, and then it grows, and then she nips at me. Last night for instance, the first text was "Y wer u off school ?" and it ended with "I duno, i wil alwais hav doubts abot u afta stirring things up wif ma friends nd doin al tht stuff that reminded me of my step-dad." THE COW !! I never done anything to her ! But the point is, she keeps on haring me and everytime I text something like,"I need to go." She always replies "You liar, are u attention seekin ?" which doesn't let me get away from her. I'm basically waiting for her to text me tonight, HELP ! What should I do or say ? And before you say "Don't reply to her" that will just make everything worse. She some how manages to make me feel like crap, also, what is she actually trying to do and what is she actually doing ?