VERY difficult girl..help

Hi everyone. Can someone please help me with this problem (will try and keep it short as possible). New girl starts at work around 8 months ago. I have a very sarcastic SOH so used it as normal etc etc. At one point she even said "your a bit of a catch, you're good looking AND nice". A few weeks later she tells a (girl)friend of mine that "he is hot. His pictures dont do him any justice" Obviously this is good, right? Well after this time was when she does the whole bitchy act. She talks to everyone it seems except me. If she did talk to me it will be to do a 'put down' or little digg. Everyone seemed to notice this and asked her why she is so horrible to me even though im a good guy. We argued a couple of times with her apologising. Fast forward a few months..she goes on holiday and to make amends i wished her a nice holiday. When she came back she was lovely to me for weeks. The usual touching of the arm and saying "i should settle down" etc. I was thinking this is great. I should mention inbetween all of this she has an ex mate who did loads of stirring about me, but the fact she was talking is great. 2 weeks ago i get told that my contract at work is coming to an end and i may have to transfer. Dont know if it was coincidence but since this she has been blanking me like hell. Never saying hi or goodbye. Even though im trying to chat to her like normal. At one point we were standing side by side and NO one spoke. It has got so awkward now that i dont wanna go and face her. I mean, even if i say hi she will give a dirty look and "huhh" which i assume is a hi. Can anyone help me out? Do i blank her totally or what here?

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