[Srin Tuar]

Spoiler:

Karada probably thought that she ruined both people's lifes. Therefore she decided that she should leave ASAP and give Hiro his life back.

Hrm, if she made that connection just from one picture, she is a quick study.

Sadly, I wonder if she realizes that by running away she is actually making things worse.
She could have stayed and tried to make them get back together.

I admit I wasnt sure why she ran off, but I think your theory is correct.