For a good bit, she was forcing herself to work even though she was sort of dealing with some stuff emotionally. There are some interviews released around A ONE that basically talk of her running away from Japan to America and "abandoning" Japan.
Getting some links.
http://ahsforum.com/forum/showthread.php?t=121548
- 109news article
http://ahsforum.com/forum/showthread.php?t=121947
- Numero Tokyo
Thanks to tenshi no hane for translations.