I would try to relax until May. Go about your life, maybe even delete her from Facebook so you are not constantly reminded of the situation. Try to be calm/professional in May and see if that won't get at least the same response from her, which will be fine for work.

"Chasing after" her and trying to get a response out of her might be making her more uncomfortable, it's no longer a give-and-take relationship, no longer the relationship you had, no matter what you do, and it may look to her that you don't get that and the harder you chase, the harder she will run. So, stop in your tracks and accept that you have done all you can for now, the ball is in her court and she gets to do what she wants with it (throw it back or keep it). Maybe with your being close at work in May, the relationship will begin again/resume, but let her make the first move, it's her move.