What can i do? Workplace Problems?

Where i work there is a woman who is constantly causing me problems. She will ask and tell people she believes i am racist because i do not spend time talking to her. I am not a racist. I get paid to work, not to talk to her. She has told the new employees she believes i am racist and they in turn ask me. This has come up on my job review and i have gone as far out of my way as i am willing (im not going to waste time talking to her...i will be fired if i waste time doing that), but it doesnt help. My boss said he has no problem with me, but i am still worried, this is getting out of hand. There are other people in the office who believe is talks too much and bothers them but they side with her and say she doesnt realize it. They arent doing anything to remedy this situation as far as i can tell. Its a weekly thing where she will tell one of my bosses ';She doesnt like me,etc'; Its starting to stress me out and im worried i might be fired because of this. Anything i can do about this?