How do I handle this situation?

I work in an office type setting and am continually having to deal with the ual advances of our secretary. She will flirt, wink, and say things in a ually suggestive manner, the problem is this makes me extremely awkward, and I don't want anything ual from her. I am a male so what is the appropriate action to take? The only time she has actually propositioned me was at a company dinner, so technically outside of work, how should I handle this?