I'm inclined to say she's interested in you but the timing is off and she moved out of the country. Am I misunderstanding this? Why do you still need to be polite for work reasons?

If I'm on the right track, leaving a relationship is very hard. Did she explain to you why she left her partner and fled the country?

Her current relationship is a rebound one. It's an unhealthy way of coping through changes and a significant loss. I don't think it had anything to do with you, and distancing from her is probably a good idea. I don't get the impression she was playing mind games.

Maybe you didn't "date" her but you definitely formed some level of emotional connectivity with her. Take care of you! Meet others and this will pass. I'm sorry this sucks. It definitely sounds disappointing.