Obviously my assumptions can be totally wrong, they are based on the limited information provided here and on my personal experience, you have of course the whole picture and you can assess way better and more accurately, sorry if I sounded too rigid in what I said.

If I have understood correctly you work in the same office with her? It might be difficult to keep her out of your mind if you like her (even if it is just in a physical way) and you have to be with her in the same place all the time.