So i met a girl on holiday, and because of my job and because of her also moving to another country for 4 months because of her Uni course the only way of contacting her that i have is through email/facebook and letters.

Note: When i met her on holiday we spent a day together, with lots of kino, teasing etc. but did not K-Close at the end just a hug.

How using these two methods (letters and email/fb) can i try to show interest and escalate that, without seeming needy and also try to stay away from boring chat that will land me in the friend zone?

And should i tell her that i am attracted to her?

Thanks in advance for any help guys!