Replying to How to get a girl to not like you.

I just read some threads on here and probably 1/2 of them were "how to get a girl to like me"... but I need the opposite.

There's this girl I work with, she's annoying and gross and I always make fun of her but somehow another one of my coworkers told me she told her she likes me... and that's really not cool.

What should I do? I'm already a huge asshole to her and that's how it all started? Should I just kick her in the teeth and get it over with?