Some of the reading I've done on the ISH says that it may be internalized therapy or even a good spiritual core---like maybe there was some good sometime in the life----whatever it is, it has kept us from dying--literally. I think that she is what prevents us from destroying us. Even when Naomi acts out, Ajna seems to step in at the "moment of truth" and either tells T or somehow prevents that one deep fatal cut.
I am ever thankful for Ajna.