Girl from work added me on Facebook , sort of surprised she did , now what?

i had actually though about adding her but didn't have the urge yet and since she had a boyfriend wasn't sure it go over the right way as I'm single . anyways now she has added me for whatever reasons so I can add her now . but I of course wonder what might be her motivations for doing so as she's pretty good looking and were only friends at work and yeah she has a boyfriend . I just though it was odd she did this , but I've got the feeling she was into me and maybe even liked me .
Girl from work added me on Facebook , sort of surprised she did , now what?
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