Please advise about my girl (waiting so many ppl opinion) and help my soul?(2nd)?

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 hadnt heard 4a week, but 10days ago, I received a postcard, said '' A Thought for you , Your French Girl ''...but pls advise do u think if she really like me?i can not ask her feeling becasue the postcard says to me ''your girl'' anyway i feel i am no-confidence and still preoccupied,but now how often should i txt her? stop txt her for a while,make her move or what?C dont txt me mucc so.. tell me what ? Thanks !