Please advise about my girl (waiting so many ppl opinion) and help my soul?

Hi, i love a girl in france,(am in London) only met twice(once i kissed her) though known for two years now, a month ago I emailed her i wanted to have a relationship even though the distance, she said to me she was busy practice for her job but said would like to begin from Sept as she will have time i didnt answer for two days thinking..and she emailed me again asked if i want it or not...Sept...I said YES I'd wait (i really like her lol) since she doesnt txt or e-mail me much,(she usually dont unless i email ot txt) and i was wondering about her about two weeks ago cos I had not heard from her 4a week, but about 10days ago, I received a postcard from her, said '' A Thought for you , Your French Girl ''...i have never received such a sweet letter before. but pleae advise do u think if she really like me?I mean i can not ask her feeling again and again becasue the postcard says to me ''your girl'' but i am not sure or i am thinking too much, i should keep cool right ?