honestly you have to let her go! It hurts you to leave her behind, but honestly if she truly felt the same way you actually feel about her she would have say yes.
that or she simply doesn't want to leaver her family behind.
as i confirm she isn't able to go extra mile for you? Broke promise? She doesn't love you the same way! You do, or willing to go that far as you would for her.
my advice is to move on with your things and focus on that First. Later, if you wish to go Back for her and she isn't taken you May still have a chance.