I think that this young lady is enjoying your attention... it makes her feel a bit powerful. If I were you I would now ignore her for a while...a long while!! If she touches you move away, if she speaks to you pull others into the conversation, make new friends at work etc etc. She will either get bored with her game (which I suspect is most likely) or she will decide that she likes you a bit more and maybe ask you to go for a coffee with you. PLease don't continue letting her play with you ..it seems to be upsetting you and that is not fair.