Perhaps an old address? The town she was from? It's kind of like me asking you to find Sue Smith, she's from Canada; can you locate her for me. We have had some people located in Japan, so it's not impossible. Good luck!
Do you mean that you contacted her parents' old address but they had moved? Even if that is the case, the old address (and her father's name) would at least be a clue. Chances are they moved within the same prefecture or to a neighboring one and knowing the old address would be a good starting point to finding a new one.
sending a letter to her parents address but I never heard back and the letter never was returned. I don't know her parents first names. last name was the same and I know they lived in kagoshima but can't remeber the pref.