Just document what you do each day and make sure you are "smarter" than she is. Spend as little time as you can around her (so she can't say you said such-and-such). Catch her in a really big whopper, preferably involving someone else, and then turn her in to her boss. Next time your boss asks you something involving her, get "angry" that he even asks. Let him know that you don't want to hear about her anymore, that you don't like her, think she should be fired or brought up short for her accusations and to quit "bothering" you, you're trying to do your job well/only and make money for the company :-)