Not answering the message?

I met someone in metro (kind of by chance). She is from France and was visiting my country. We went out and had a very good night. It's not just my opinion. When she wanted to leave, asked me to stay in touch with her. And told lots of things about how nice and kind I am. But she doesn't reply to my messages properly or she replies after a week.
I don't know much about french people. Now I want to know is it common?
Or Does it have any secret meaning that, I don't send her message anymore?
Not answering the message?
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