If there are ways to contact her when she is away, then try to maintain contact with her even if it’s a snail mail, at least show her that you are still there and care for her.

Secondly, if she does come back later, seek an opportunity to have a heart to heart chat with her, especially in the aspect of why she can’t love you, try to find out the reason why only then you can know what’s the problem that you need to deal with and overcome. However, I must add that your approach must be cautious, understanding, patience and gentle. Try to listen and understand from her points of view or perspective, put aside your own feelings. Show her that it’s because you care and you want to help her if she allows you to.

Approach the heart, not the mind.

Lastly, personally, I don’t believe in long distance relationship especially those that through the cyberspace, of course that don’t mean absolute, cause I know there are few successful cases, but I think that is more a exception than norm.

In any case, all the best to you.