My advice? Ditch her and go back to Hess.
Honestly though, if you are into this chick, why not just go all in and see what happens? Like you said, you don't even know if she may go overseas. What if you let her go now and she ends up staying and finds another man in the meantime? I guess what I'm saying is it's better to find out what you have than to be left wondering if you missed a great opportunity.