Ok, If you look in your information, or somewhere in the game, it says that when Adel's knight died, she went power crazy and went to take over the world. I think when Rinoa's knight(squall) she went a little crazy and tried to control time so she controled everything and had all the sorceress' power. In doing so, she began to forget stuff like her name and her knight through all the power. Or something like that...