Hatsuko (Morita or Wilkinson or Spence or ?)

My name is Carol Keur. I have two older sisters, Miko and Angela. I am trying to find our birth mother. Her maiden name is Hatsuko Morita. She met my father whom was in the U.S. Navy, Michael G. Wilkinson, in Japan and they got married. They had my oldest sister, Miko, in Japan. They move to Kansas in the U.S. and had my middle sister, Angela. They moved to California and had me, Carol. My parents divorced when I was a couple months old. My birth mother remarried to a man named True Spence and they had a son by the name of Christopher. I was told that they moved to Japan and divorced. I have no personnal recollection of my mother and need all the help I can to find her. She would currently be 54. My e-mail is ckeur@unumprovident.com.