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Try to stand next to her and see what book she is reading to know more about her.  Try to find an opportunity to help her like when the train stop suddenly, she may not stand to stable or drop something, you may try to give save her or pick up the thing for her and start to talk to her to have a breakthrough.  In the next day when you see her, you may say hi to her and see her reaction.  Remember not to scare her !