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if she doesn't want to establish to talk to you, does she has a close friend among your batchmates? maybe you can try to redirect the chat to that...
in my experience, you can come up with so many approach and preparations but your self-esteem and courage will do the first step and initial push....
i think both the tradition and modern ways have their goods and bads. Either way, you just really to be careful and get to know person first.