Feelings of insecurity, and a very large dose of homesickness will cause these symptoms....
I would sit down and have a heart to heart and see if this is what she really wants.
It is no good finding out after the fact, all the loving reassurances in the world will not be enough to stop that behaviour.
I personally think that, secretly, she wants to go back home.
I dearly hope I am wrong with this assumption.
I wish you all the best of luck.
