who can help me to find a japanese friend ?

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hi , everyone .I am a Chinese girl and when I studied in primary school i have met a japanese girl , we became good friend then .But she returned to Japan a year before I graduated from primary school . And after that I lost her e-mail address and address which in my notebook . And these days I finally found it ,I am so excited .But now I am a high school student and I don't kown whether I can find her .I have tried to send e-mails but they are failed , I don't know whether the e-mail address is wrong or she changed it .Also I want to write a letter ,but I am not sure she can recieve it , maybe she has moved during this 5 years .So what can I do ? I really want someone who live in Tokyo that can help to make sure the address .I really missed her .Or if you can give me some advice , it will also be good . PLEASE , THANKS !