Backstabbers at work

I work with this backstsabber whose favorite target is my back.... She asked me what time did "so and so go out for break" and I said "gee I don't know, I'm not her keeper.... Then she said, "I need to know" and I said "maybe if your weren't so busy gossiping maybe you could keep track of your own people...." Then she said "I'm reporting you to upper management and I said KMA in capital letters.. I then told her my job is to keep tools running and her job is to keep people running...