I've actually been wondering if it's some sort of PTSD. Miko's mind-read suggested some sort of catastrophic psychological change, and I want to investigate that.
Really, though, in the long run, the only part of Kotohime's mind that truly concerns me is the allegedly shitty memory. This right now is a curiosity, but not much more.
> Youmu: "Well, the immediate issue is being dealt with as best we can at present."