Sounds like she is going to go one year in Japan and then retire.Sane is a bit of a shock because she's fairly new and came through the ranks. You could even see a storyline building with her and Asuka feuding, so this is a bit of a shock. I feel for her though, hopefully she'll go NJP and tear things up there.
I reckon there might be more to her head injuries. Ever since she got KO'd a while back during a fight, shes been sporadically appearing.