Here is a link to what she wrote on Nojima's webpage. http://stellakanagawa.nojima.co.jp/news/pg1245760.html I will let you do the google translate. But basically she had nothing else left to give soccer. She mentioned that even when she graduated from university she thought about giving the game away. She does not mention anything about playing for Nadeshiko, which could mean anything. Her fondest achievement was gaining promotion to League 1. Also the manager of Nojima Masaki Kanno announced his retirement in November, which may also be linked to her deciding to retire. She went to quite an elite university in Japan, so she should be able to find a pretty good job.